Question # 1

The systolic blood pressure comes when

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Vessel collapse

Cutting off the blood flow

None of these

All of these

When 400.1 is added to 20.54 we get

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420

420.65

420.1

420.6

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either A or B

Either B or C

In projectile motion when a body is projected upward it must have

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Initial velocity

Angle θ < 90^o

Falling under gravity

All of these

A wire can support a load W without breaking. It is cut into two equal parts. The maximum load that each part can support is:

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W/4

W/2

W

2 W

Wavelength of red color as compared to that of violet color is

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Smaller

Longer

Equal

None of these

For incident angles equal or greater than the critical angle the glass air boundary will act as a

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Convex mirror

Concave mirror

Mirror

None if them

In which process the change in internal energy of the system is zero:

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Isochoric process

Isobaric process

Adiabatic process

Isothermal process

When an image formed by the objective lies at the focus of both the objective and the eye-piece, the telescope is said to be in

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Final adjustment

Normal adjustment

Initial adjustment

None of these

In case when there is not total displacement and average velocity, then the motion is described by

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

The dimensions [MLT^-1] refers to the quantity

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Force

Momentum

Impulse

None of these

For all the irreversible processes the entropy of the system

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Increases

Decreases

Remains constant

None of these

The equation (V₁- V₂) = - (V₁- V₂) shows that relative velocities before and after the collision has the

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same magnitude and same direction

same magnitude and opposite direction

different magnitude and opposite direction

different magnitude and same direction

The relationship between Boltzmann constant K with R and N_Ais given as:

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k = RN_A

k = R/N_A

k = NR/N_A

None of these

Young's modulus for brass is

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40

60

90

91

The region of plasticity represents

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Proportional limit σ_p

Elastic limit σ_e

UTS (ultimate tensile strength σ_n)

None of these

A couple consists of

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Two equal and opposite forces acting at a point on a body

Two equal and parallel forces acting at a point on a body

Two equal and anti parallel forces acting at two different points on a body

All of these

Total area of cross section is 0.25 m². If blood is flowing at rate of 100 cm³ /s then average velocity of flow of blood through capillaries is

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4mm/s

0.4mm^-1

400mms^-1

None

The dimensions of work are

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[MLT^-2]

[ML²T^-1]

[ML²T²]

[ML²T^-2]

The fiber of which refractive index ______ gradually as move from central core to its periphery is called ______ index fiber

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Decreases, multi-mode graded

Increases, single mode step

Either of A or B

Increases, multi-mode step

The magnifying power of an instrument is expressed in

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Radians

Degrees

No units

None of these

A man sitting in a bus traveling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down.To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polystrene

None of these

By calculating the area under the velocity time graph, we can find the

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Acceleration

Velocity

Distance

None of these

The phenomenon of diffraction can be exhibited by

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Polarized waves only

Un polarized waves only

Longitudinal waves only

All polarized or un polarized waves and longitudinal or transverse waves

The lowlying Earth satellites have acceleration

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9.7 ms^-2

9.9 ms^-2

10.0 ms^-2

9.8 ms^-2

A beam of light of wavelength is incident normally on a grating of element d the angle between the zero-order and first -order spectra depends on

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λ only

d only

λ and d

λ d and distance of screen from the grating

Can the resultant of 2 vectors be 0?

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Yes when the 2 vectors are same in magnitude and direction

No

Yes when the 2 vectors are same in magnitude but opposite in sense

Yes when the 2 vectors are same in magnitude making an angle of 2π/3 with each other.

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

Source of light used in the fibre optic communication

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Led

Laser

Photo diode

Both a and b

Metals are good conductors of electricity and their conductivities are of the order of

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10³(Ω m)^-1

10⁴(Ω m)^-1

10⁶(Ω m)^-1

10⁷(Ω m)^-1

𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:

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Spontaneously

When it is put in a reactor

When it is heated

Under pressure

Negative of vector can be made when

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Magnitude is made negative

Directions is reverse with negative magnitude

Only direction is changed

None of these

The approximate efficiency of Nuclear reactor

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33%

32%

39%

45%

In digital modulation, the LED or laser flashed on and off at a

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Fast rate

Very fast rate

Extremely fast rate

None of these

The slope of the tangent at any point on the curve gives the value of the

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average velocity at that point

instantaneous velocity at that point

average acceleration at that point

instantaneous acceleration at that point

According to Huygen's principle, every point of a wavefront may be considered as a source of

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primary wavelets

secondary wavelets

either of them

both of them

Which one of the following can act approximately as a source of monochromatic light

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Neon lamp

Fluorescent tube

Sodium lamp

none of these

In a full wave rectifier:

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DC current is twice that of half wave rectifier

DC pulses are twice per cycle that of half wave rectifier

DC voltage is twice that of half wave rectifier

All are correct

When m₁= m₂, the velocities of both bodies become

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V'₁= V₂and V₁= -V'₂

V'₂= -V₁and V₁= V'₂

V'₁= V₂and V'₂= V₁

None of these

A straight current carrying conductor experiences maximum forces in a uniform magnetic field when it is placed:

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Parallel to the field

Perpendicular o the field

At an angle of 45 to the field

None of these

The fine rulings on a compact disc as a diffraction grating but each line is wide like

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0.01 μm

0.5 μm

0.05 μm

0.6 μm

Acceptor impurities donate

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Holes

Electrons

Both Electrons and Holes

None of them

Magnification of a convex lens is

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M = p/d

M = p/q

M = q/p

None of these

Two masses of 1 g and 4 g are moving with equal kinetic energies.The ratio of the magnitudes of their linear momenta is:

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4 : 1

√2 : 1

1 : 2

1 : 16

In an interference pattern of Ypung's double Slit (YDS) experiment:

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Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

The number 134.7 should be written as

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13.47 × 10²

1.347 × 10²

13.47 × 10³

None of these

In semiconductors at 0 K the valence band is

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Completely filled

Partially filled

No

Yes

The magnitude of the electric field on the surface of a sphere of radius 'r' having a uniform surface charge density σ is

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σ/∈_o

σ/2∈_o

σ/∈_o r

σ/2∈_o r

Reflection of light from water, glass, snow and rough road surfaces, for larger angle of incidences, produces

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images

bright images

interference

glare

The young's modulus of a wire of length L and radius 'r' is Y. If the length is reduced to L/2 and radius to r/2, its Young's modulus will be

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Y/2

Y

2Y

4Y

The efficiency of half wave rectifier is:

Choose an answer

25.6%

1.2%

40.6%

66.6%

If a transverse wave has a speed of 10 m/ sec and frequency of 10 cycle/ sec itswavelength is:

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1 m

10^-2 cm

10 m

10 cm

A mass of 5 kg moves with an acceleration of 10m s^-2, the force applied is

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10N

50N

2N

20N

The energy needed to amplify and transmit the signals is provided by the satellite by

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Batteries

Generator

Solar cell panels

None of these

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

Einsteins theory donot tell the force of gravity acting on bodies instead, bodies and light maces along geodesies in

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Space time

Straight space time

Curved space time

All of these

Angle subtended by any side of the eight-sided mirror at the center is

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π/8

π/4

2π/8

2π/4

What quantity produces the angular acceleration in body

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Momentum

Inertia

Moment of inertia

Torque

Radius of planet A is twice that of planet B and the density of A is one third that of B. the ratio of the acceleration due to gravity at the surface of A to that at the surface of B is

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2 : 3

3 : 2

3 : 4

4 : 3

The error in the measurement of radius of sphere is 0.3% The maximum error in the measurement of its volume

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0.6%

0.9%

0.3%

(4/3) π(0.3)²

Which characteristics of wave, established the Huygen's wave theory in 1801?

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polarization

interference

propagation

all of them

The velocity-time graph is a horizontal straight line when the velocity of the car is

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zero

constant

decreasing

increasing

In an inelastic collision

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Both K.E and momentum are conserved

Both K.E and momentum are not conserved

Momentum is conserved and K.E is not conserved

K.E is conserved and momentum is not conserved

The identity of an element is determined by:

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the number of its protons

the number of its electrons

the number of its neutrons

its atomic mass

Viscosity of methanol at 30^oC in NSm^-2

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0.341 × 10^-3

0.357 × 10^-3

0.369 × 10^-3

0.510 × 10^-3

The orbital angular momentum is associated with the motion of a body

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Rotating body

Revolving body

Along a circular path

None of these

Bulk modulus for bass is

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20

41

61

81

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

The force exerted by the fluid in a hydraulic pump on the piston is 2000 N.If the area of the piston is 10 cm² the fluid pressure on the piston is in N/cm²

Choose an answer

20

200

2000

20000

Two forces of 4 dyne and 3 dyne act upon a body.The resultant force on the body can only be

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Between 3 and 4 dyne

Between 1 and 7 dyne

More than 3 dyne

More than 4 dyne

A rubber cord 100 cm long is elongated 1 cm by a stretching force of 0.2 N. The cross-sectional area of the cord is 0.04 cm². Find the Young's modulus for that rubber.

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0.5 N cm^-2

0.05 N cm^-2

50 N cm^-2

500 N cm^-2

The critical temperature for mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

Femto means

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10^-15

10^-18

10^-2

10^-12

A typical rocket ejects the burnt gases at speeds of over

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4000 ms^-1

5000 ms^-1

6000 ms^-1

None of these

Which one is least multiple?

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exa

femto

atto

nano

The dimensions [ML²T^-2] refers to the quantity

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Work

Spring constant

Torque

Both A and C

Which one of the following particles projected perpendicular to a uniform magnetic field with the same velocity will be deflected least?

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Electron

Proton

Deuton

None of these

The product of force times the perpendicular distance between some point and the line of action of the force is

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The moment of inertia action on it

The moment of force about the chosen point

The angular momentum of the body

None of these

The dimensions [MLT^-2] refer to the quantity

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Acceleration

Velocity

Force

Momentum

A 100W, 220V bulb is operated on a 110V line, the power consumed is:

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25W

75W

50W

100W

Surface tension of water is due to

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Inter molecular attractions

Intermolecular spaces

Inter molecular repulsion

None of above

A gas exerts pressure on the walls of the container because molecules

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Have finite size

Obey Boyle's law

Have momentum

Collide with one another

Mathematically the first condition for equilibrium can be expressed as

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ΣF_x = 0

ΣF_y = 0

ΣFx = 0 and ΣF_y = 0

ΣFx = 0 or ΣF_y = 0

The rate of change of angular velocity is called

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Angular displacement

Angular acceleration

Instantaneous velocity

None of these

When a person jumps off the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

The temperature scale approved in SI units is:

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Calslus scale

Kelvin scale

Fehrenhelt scale

None of these

The magnitude of velocity at any instant is

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According to WH Bragg and WL Bragg monochromatic beam of X-rays was reflected form a crystal plane is like a

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Smooth and regular

Mirror

Thin film

None of these

The age of universe is

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5 x 10¹⁷ sec

1.4 x 10¹⁷ sec

3.2 x 10⁷ sec

8.6 x 10⁴ sec

The theory which explains the vast diversity in an electrical behaviour of all types the materials is

Choose an answer

Free electron theory

Band theory

Theory based as chemical properties

None of these

The light signal in graded index fibre is totally confined due to

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Total inernal reflection

Continuous refraction

Both a and b

Dispersion

The ideal gas obey gas law at:

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Low tempratures and high pressures

High temperatures and low pressures

All temperatures and pressures

None of these

the ratio of mean K.E of chlorine and oxygen molecules at same temperature is

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16 35.5

35.5 16

(35.2)²16

1 1

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

The rightward forces acting on a body in equilibrium are taken as

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negative

positive

either negative or positive

none of them

The lift of Aero plane based on

Choose an answer

Law of gravitation

Bernoulli's theorem

Torricelli's theorem

Law of conservation of momentum

Two monochromatic radiations X and Y are incident normally on a diffraction grating.The second order intensity maximum for X coincides with the third order intensity maximum for Y what is the ratio wavelength of X/wavelength of Y?

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1/2

2/3

3/2

2/1

The typical speed of commercial automobile (max) is

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50 ms^-1

60 ms^-1

62 ms^-1

65 ms^-1

The centripetal force for a car moving on a road is given by

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Friction due to tyres

Force of brakes

The driver of the car

Force by steering wheel

Upon applying some unbalanced external stress the deformation may be observed in

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Length

Surface area

Volume

All of these

A device which convert DC into AC is calleD)

Choose an answer

Invertor

Generator

Rectifier

Motor

If the direction of force acting on a body capable of rotating about a point is reversed than

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Magnitude of torque changes and direction remains same

Magnitude of torque changes and direction is reversed

Magnitude and direction both changes

Magnitude of torque remains same and direction is reversed

For a fixed force, larger is the mass of a body, the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

The greatest stress that a material can endure without losing the proportionality between stress and strain is called

Choose an answer

Plasticity

Breaking point

Proportional limit

Strain

Number of supplementary units are

Choose an answer

three

two

seven

five

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

Choose an answer

4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

Solid angle is

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Two dimensional angle

Three dimensional angle

One dimensional angle

Multi-dimensional angle

An axis which is at right angle to both X and Y and Y axes direction is in space is called

Choose an answer

Unit vector axis

Zero vector axis

Z-axis

None of these

When a horse pulls a cart.the force that makes the horse run forward is the force exerted by

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The horse on the ground

The horse on the cart

The ground on the horse

The ground on the cart

The capacitance of a parallel plate capacitor does not depend upon

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Area of plates

Medium between plates

Distance between plates

Metal of the plates

In a never system, the repeaters are placed at about

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50 km

75 km

100 km

125 km

A body falling freely under the action of gravity has

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Constant weight

Variable weigth

Maximum weigth

No weigth

For the conversion of heat into work, the two bodies are essential as temperature which is

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Similar

Very little difference

Large difference

None of these

Which phenomenon of light conclusively prove that light waves are transverse waves

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Reflection

Diffraction

Interference

Polarization

The components of a fibre optic communication system is/are

Choose an answer

At transmitter

An optical fibre

Receiver

All of these

A body starting from rest covers a distances of 0.45 km and acquires a velocity of 300 Kmh^-1its acceleration will be

Choose an answer

7.71 m s^-2

0.5 m s^-2

0.15 m s^-2

0.092 m s^-2

The junction potential for Germanium is;

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3v

0.3 v

7v

0.7 v

The capacity of a condenser when a dielectric is placed in between its plates

Choose an answer

Increases

Decreases

Doest not change

A force of 0.01 N is exerted on a charge 1.2 x 10^-5C at a certain point The electric field at that point is

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1.2 x 10⁴N/C

8.3 x 10²N/C

8.3 x 10^-2N/C

Selenium is an

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Insulator

Conductor

Semiconductor

Photo conductor

The rotational analogue of Newtons second law of motion is

Choose an answer

mr²α

mrα

mrα²

None of these

Base quantities are those which

Choose an answer

Remain the same

Can be derived

Further divided

None of these

The final image obtained by astronomical telescope is

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Inverted w.r.t object

Magnified

Virtual

All of them

S.I unit of stress is

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N/m

N m

Nm^-2

newton

The resolving power of a grating spectrometer is

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Which one of the following phenomena is not explained by Huygen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of spectra

Light year is the unit of

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Speed

Mass

Distnace

Time

If the direction of r and F are reversed, then

Choose an answer

The magnitude of the torque changes but direction remains unchanged

The magnitude of the torque does not change but direction reverses

The magnitude and direction of the torque change

The magnitude and direction of the torque remain unchanged

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15 m is

Choose an answer

9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

Diesel engine coverts ____________ of available heat energy into work.

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20% to 25%

25% to 30%

30% to 35%

35% to 40%

A person walks first 10 km north and 20 km east.then the resultant vector is

Choose an answer

22.36 km

22.46 km

25.23 km

20.36 km

Spectrometer can be used to

Choose an answer

Measure wave length of light

Measure refractive index of the materials

Study spectra of light

All

The units of torque and couple are

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N-m and N-m²respectively

N-m and N

N-m^-1for both

N-m²and N-m respectively

The interference fringes are of

Choose an answer

equal width

variable width

zero width

non-uniform width

In young's slit experiment on interference the ratio of the intensities of a bright band and a dark band is 6 : 1 the ratio of the amplitudes o the interfering waves is

Choose an answer

16

5/3

4

1/4

The domains are the small regions of the order of

Choose an answer

Millimeter

Micrometer

Micron

None of these

Which of the quantity is dimensionless:

Choose an answer

Strain

Stress

Modulus of elasticity

Work

Entorpy

Optical fibres are of

Choose an answer

Five type

Two type

Three type

None of these

For an adiabatic expansion of a gas which of the following statement is false?

Choose an answer

Pressure of gas decreases

No heat is supplied to the gas

Work is done by gas

Entropy of gas is increased

If the cover of a red book is observed in monochromatic blue light,It will appear

Choose an answer

White

Red

Black

Blue

The horizontal velocity component in projectile motion is

Choose an answer

Zero

Constant

Maximum

None of these

The force between two charges in 8 N. Now placed a mica of relativity 4 between two charges as a medium, the force then reduced to

Choose an answer

2 N

4 N

6 N

8 N

Shear modulus for water is

Choose an answer

- 4.7

- 3.3

- 1.2

0

The volt is equal to

Choose an answer

C/q

N/m²

Joule/coulomb

Nm²/C

The deflection by Einstein is as great as newtons is

Choose an answer

Twice

Thrice

Four times

Half time

The law of conservation of momentum says that the total angular momentum of the system remains constant if no external

Choose an answer

Force acts on it

Torque acts on it

Frictional force action it

None of these

Proportion of light in an optical fibre requires that the light-should be within the fibre

Choose an answer

Very little confined

Largely confined

Totally confined

None of these

According to Einsteins theory, gravity follows the inverse square law expect in

Choose an answer

Weak gravitational field

Strong gravitational field

Very very weak gravitational field

None of these

If the water exists from the pipe at the rate 1.5 kgs^-1 at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

Choose an answer

5.53 N

5.03 N

1.35 N

0.45 N

The approximate efficiency of dry cell battery is

Choose an answer

80%

90%

70%

50%

When the car moves with increasing acceleration, the velocity time graph is a

Choose an answer

Straight line

Horizontal straight line

Curve

None of these

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

Choose an answer

Decreases

Increases

Remain same

None of the above

Everything in the vastness of space is in a state of

Choose an answer

Rest

Motion

Perpetual motion

None of these

A car covers 1/3 distance with speed 20 km/hr and 2/3 with 60 km/h.Average speed is

Choose an answer

40 km/h

50 √2 km/h

36 km/h

80 km/h

The deformation measured in terms of some twisting angle due to action of stress is known as

Choose an answer

Stress

Linear stress

Compressive stress

Shear stress

The polymeric solids have specific gravity compared with even the lightest of metals

Choose an answer

Low

Very Low

Slightly low

None of these

The field in which the work done be independent of the path followed is called

Choose an answer

Conservative fields

Non-conservative field

Varying intensity field

None of these

Chimney works best when it is

Choose an answer

Tall

Short

Of any shape

Insufficient statement

Fringe spacing in YDS experiment will be maximum if we use

Choose an answer

Red light

Green light

Violet light

Blue light

Substances which undergo plastic deformation until they break are called:

Choose an answer

Ductile

Brittle

Malleable

Soft

Hard

When the velocity of a body is increasing, the acceleration produced is

Choose an answer

No acceleration produced

Negative acceleration

Positive acceleration

None of these

At high speed and for long trajectories the air friction is

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Negligible

Equal to gravity

More than gravity

None of these

The travel time of light from Moon to Earth is

Choose an answer

2 min 10 sec

1 min

1 min 20 sec

3 min 30 sec

Viscosity of ethanol at 30^oC in Nsm^-2

Choose an answer

0.954 × 10^-3

1.000 × 10^-3

1.012 × 10^-3

1.014 × 10^-3

If the wavelength of light used in Michelsion's interferometer is 400 nm and the moveable mirror only moved throughλ/4, then the length moved will be

Choose an answer

10 nm

10^-2mm

1 nm

10^-4mm

The fringe spacing in case of red light

Choose an answer

Increases

Decreases

Remains the same

None of these

An electric force which hold the charges to make atoms and molecules

Choose an answer

Positive charges

Negative charges

Neutral charges

a & b

For assessment of total uncertainty when percentage uncertainties are

Choose an answer

Added

Subtracted

Divided

Multiplied

With rise in temperature the electric conductivity of intrinsic semiconductor

Choose an answer

Increases

Decreases

First increases and then decreases

First decreases and then increases

The weight of the body at the centre of the earth is.

Choose an answer

Infinite

Zero

Slightly less than that at the equator

Slightly more than that at the equator

In uniform circular motion the angular acceleration vector is

Choose an answer

Constant in magnitude and direction both

Constant in magnitude only

Constant in direction only

Varies in magnitude and direction both

Examples of an adiabatic process is

Choose an answer

Burst of tyre

Cloud formation in the atmosphere

Rapid expansion and compression of air in sound waves

All of these

Zero error of the instrument is a type of _____

Choose an answer

Random error

Personal error

Systematic error

Classified error

When m₂>> m₁and V_{2 = 0 then result of their velocities}

Choose an answer

V₂= 0 and V₁= V'₁

V'₁= -V₁and V'₂= 0

V₁= V₁and V₂= 0

None of these

The centre of gravity of a body of an irregular shape lies

Choose an answer

At its centre

inside the surface

At the intersection of medians

All of these

A body is in complete equilibrium when

Choose an answer

ΣF = 0

Στ = 0

SF = 0 and Στ = 0

None of these

If a force acts on a body whose action line does not pass through its centre of gravity.then the body will experience

Choose an answer

Angular acceleration

Linear acceleration

No acceleration

None of these

The appearance of colours in the shape (or oil) film results from:

Choose an answer

Dispersion

Interference

Reflection

Refraction

Which one is not correct representation?

Choose an answer

5N

3 Newton

5 Newton

both a and b

Which of the following have same SI units

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Force

Impulse

Momentum

b and c

The force required to bend the normally straight path of the particle into circular path is called

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Applied force

Normal force

Reactional force

Centripetal force

A flowing liquid possesses

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K.E

P.E

Pressure Energy

All

The time constant is the time required to deposit the equilibrium charge

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63 times

36 times

0.63 times

0.36 times

At diastolic pressure

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Flow become laminar

Gurgle disappears

External pressure becomes equal

All of these

Which of the following gives volts as its unit

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Current/resistance

Power x current

Rate of flow of charge

emf of a cell

The size of the domains in such that they can contain

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10²to 10⁴atoms

10⁴to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

The compound having highest %age of oxygen is:

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CH₃COOH

C₂H₅OH

H₂O

CH3COCH₃

The terminal velocity of a 2 cm radius ball in liquid is 20 cms^{-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant}

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80 cms^-1

40 cms^-1

20 cms^-1

5 cms^-1

Young's modulus for glass is

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15

35

39

55

The variation if focal length of a lens when we pass from the central portion out words (to words the lens edges) is known as

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Astigmatism

Chromatic

Spherical aberration

Coma

Bulk modulus for ice is

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5

6

7

8

Electromagnetic waves transport:

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Energy only

Momentum

Both A and B are correct

None is correct

The minimum distance between a source and the screen for which a real image is possible with a convex lens is

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Its focal length

Twice the focal length

Four times the focal length

Square of the focal length

An object moving with acceleration g is said to fall freely identify freely falling objects from the list given below

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An orange falling from a tree

A satellite orbiting around the earth

A football kicked in the air

All of these

The escape velocity of Neptune in Kms^-1

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20.26

24.03

25.4

25.6

Bulk modulus is involved when the deformation is

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One dimensional

Two dimensional

Three dimensional

All of these

Angle subtended at the centre of the circle by a body is called

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Angular velocity

Linear velocity

Angular displacement

All of these

Maximum height of a bullet when fired at 30° with horizontal is 11 m.Then height when it is fired at 60° is

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22 m

6 m

33 m

7.8 m

The changes which involve friction or dissipation of energy are reversible through

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Conduction

Convection

Radiation

All of these