Question # 1

The study of nature has been classified into branches are:

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Two

Three

Four

None of these

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 effect is to increase the inflating the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

Large CR (Time constant) value has

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Small time constant

Large time constant

Equal time constant

None of these

If stress is increased beyond the elastic limit a permanent change in the material is observed This behavior is called

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Elastic deformation

Elasticity

Plasticity

Yield strength

The locus of all points in a medium having same phase of vibration is called:

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Crest

Trough

Wavelength

Wavefront

In the Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled the fringe width is

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Halved

Unchanged

Doubled

Quadrupled

Blood is an/a

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Ideal fluid

Perfect fluid

Compressible fluid

Incompressible fluid

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

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115 m

1.15 m

11.5 m

0.115 m

The ability of anybody to return, to its original shape is called

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Elasticity

Elastic force

Stress

Strain

Fluid friction of a spherical body depend on the

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Shape

Size

Orientation

All of these

After terminal velocity is reached, the acceleration of a body falling through a viscous fluid is

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More than g

Less than g

Equal to g

Zero

In a spectrometer experiment monochromatic light is incident normally on a diffraction grating having 4.5 x 105 lines per meter.The second order line is seen at an angle of 30 to the normal what is the wavelength of the light?

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200 nm

430 nm

500 nm

556 nm

Spectrometer can be used to

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Measure wave length of light

Measure refractive index of the materials

Study spectra of light

All

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream line body

None of these

No body begins to move or comes to rest of itself said by

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Thomos Young

Abu Ali Sena

Newton

None of these

The relation for the adiabatic change is

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PV = Constant

PV²= Constant

PV^r= Constant

PV^-r= Constant

A convex ens acts as diverging lens when the object is placed

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Between F and 2F

At 2F

Within the focal length

Beyond 2F

In order to observe interference , the interfering beams must be

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monochromatic

coherent

either of them

both of them

A cane filled with water is revolved in a vertical circle of radius 4 m and water just not fall down The time period of revolution will be nearly

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1 s

4 s

8 s

10 s

The different parts of spectrometer

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Collimator

Turn table

Telescope

All of these

The approximate efficiency of solid state laser is

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35%

30%

27%

23%

The light source used in multimode step index fibre is

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A monochromatic source

Red light

White light

None of these

Three bodies are of masses m₁= 2.2 kg, m₂ = 10.02 g and m₃ = 10.01 g, the sum of their masses up to the appropriate is

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2.2 kg

2.203 kg

2.023 kg

2.0202 kg

If the tension in a string stretched between two fixed points is made four times, the frequency of the fundamental harmonic will become:

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Two times

Three times

Four times

Six times

Diffraction effect is

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More for a round edge

More for a sharp edge

Less for a sharp edge

None of these

Each atom in a metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about the centre of the crystal

None of these

Light signals in an optical fibre eventually become dim and must be regenerated by devices called

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transmitters

receivers

photodiodes

none of them

A body moving in a circular path with constant speed has

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Constant acceleration

Constant retardation

Variable acceleration

Variable speed and constant velocity

In compound microscope image formed is

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Real erect and diminished

Virtual inverted magnitude

Real inverted and magnified

Virtual inverted and magnified

The path difference involved in interference in thin films depends upon

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Thickness and nature of thin films

Angular of incidence of light

Nature of media on both sides of thin film

All of these

Magnetic field inside a solenoid is:

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) Directly proportional to current

Inversely proportional to current

Directly proportional to its length

Inversely proportional to total no of turns

The coercivity of the steel is

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less than the iron

equal to the iron

more than the iron

any one of them

The Earth and some other planets revolve round the Sun in

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Elliptic path

Nearly circular path

Circular path

None of these

Shear modulus for tungsten is

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50

100

150

200

In slow Compression of a gas in a cylinder is reversible as the compression can be changed to expansion by

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Rapid decreasing the pressure

Slowly decreasing the pressure

Extremely decreasing the pressure

None of these

If the mass of earth becomes four times to its initial value than the value of g will be

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Does not change

Becomes four time

Become one fourth of its initial value

None of these

When we consider the average velocity of a body, then the body is moving in

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straight line

curved line

may be in a straight or curved path

none of them

In relation Vt = 2gr²ρ/9η. Terminal velocity is directly proportional to

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r

r²

r³

None of these

The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object

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Smaller

Larger

Very large

None of these

When a stress change its shape it is called

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Tensile stress

Shear stress

Volume stress

None of these

In time of flight, the body the covers the distance

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Maximum

Zero

Minimum

None of these

The value of solar constant in SI system is

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1340 watt/m²

1340 m²/watt

1340 watt/m

The original source of Wind energy is

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Tides

Waves

Sun

Moon

When a silicon crystal is doped with trivalent impurity which are

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Indium

Arsenic

Phosphorous

None of these

A frame of reference stationed on Earth is approximately an example of

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Inertial frame

Non-inertial frame

Every frame

None of these

In between two consecutive permissible energy band there is a range of energy states which cannot be occupied by electrons. These are called

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Energy band

Energy states

Forbidden energy gap

None of these

There is a regular arrangement of molecules in

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amorphous solids

polymeric solids

crystalline solids

none of these

N-kg^-1is the unit of

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Velocity

Force

Acceleration

None of these

Newton's third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

The body moving with uniform velocity may be

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in equilibrium

accelerating

changing in direction

changing in magnitude

A non-conducting semiconductor diode is:

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Forward biased

Poorly biased

Reverse biased

None of them

If we keep the moment arm, fixed while change the force, then, the torque is

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Changed

Does not change

Some what change

None of these

The critical temperature T for is

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1.6 K

2.71 K

3.72 K

2.82 K

The process of liquefaction and evaporation of a substance performed slowly are

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Reversible

Practically reversible

Not reversible

None of these

The law of conservation of energy is the base of

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Stoke's theorem

Carnot's theorem

Bernoulli's theorem

None of these

The intensity of the earth's gravitational field is maximum at

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The centre of the earth

The equator

The poles

None of the above

In Bragg's formula, the path difference should beam integral multiple of the wavelengths

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d sin θ = nλ

d sin 2θ = nλ

2 d sin θ = nλ

None of these

A charge Q is divided into two parts q and Q - q and separated by a distance R.The force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

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

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

Stoke's law holds for bodies of the shape

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Spherical

Rectangular

Oblog

All of these

According to Young s experiment if frequency of light used is halved then fringe width becomes

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2/3

Double

Remains constant

Fringe

A Perpetual motion is that motion which is

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Temporary

Continuous

Forever

None of these

The angle between rectangular components of a vector is

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0°

60°

90°

120°

The dimensions of velocity are

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[LT]

[LT²]

[LT^-1]

[LT^-2]

The dimensional formula for angular momentum is:

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(M°L²T^-2)

(ML²T^-1)

(MLT^-1)

(ML²T^-2)

When a plane polarized light is passed through certain crystals they

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Are totally absorbed

Are totally reflected

Rotate the plane of polarization

None of these

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 wire be

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Y / 2

Y

2 Y

4 Y

If it is assumed that a frictional force f is present, during the downward motion their

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mgh - f = 1/2 mV²

2mgh - f = 1/2 mV²

mgh - f = 1/2 mV²

None of these

An electron of charge e coulomb passes through a potential difference of V volts,its energy in 'joules' will be

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V/e

eV

e/V

V

If a ball comes back to its starting point after bouncing off the wall several times, then its

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total displacement is zero

average displacement is zero

none of them

both of them

Which combination of 7 identical resistors of 3-ohm will give 12/13 ohm:

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3 series, 4 parallel

5 series, 2 parallel

2 series, 5 parallel

4 series, 3 parallel

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

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

Choose an answer

Y/2

Y

2Y

4Y

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

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20%

80%

50%

None of these

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

Choose an answer

r

r²

r³

None of these

Moment of inertia of a thin ring or hoop is

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mr²

2/3 mr²

5/6 mr²

1/3 mr²

When the length and area of cross-section both are doubled, then its resistance:

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Will become half

Will remain the same

Will be doubled

Will become four times

The approximate efficiency of storage battery is

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60%

72%

80%

87%

Which mode can carry more than 14 TV channels or 14000 phone cells?

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single mod step index

multimode step index

multimode graded index

all of them

The forbidden energy gap in semiconductors

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Lies just below the valence band

Lies just above the conduction band

Is the same as the valence band

Lies between the valence band and conduction band

The speed of a falcon in a dive is

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23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

The value of acceleration due to gravity on the surface of the earth is g.If the diameter of the earth becomes double of its present value and its mass remains unchanged, the value of acceleration due to gravity on the surface of the earth would become

Choose an answer

g/2

g/4

2g

4g

Two lenses of power +12 and -2 diopters are placed in contact the power of combination is

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10 diopters

8 diopters

6 diopters

12 diopters

The certain physical properties of a material are used to construct a temperature scale which varies with temperature

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Linearly

Inversely

Remains constant

None of these

A 50 kg man is falling freely force acting on it will be

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5 N

50 N

500 N

zero

By the slope of velocity time, we can determine the

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Acceleration

Constant velocity

Average velocity

Average acceleration

How much water a pump of 2kW can raise in one minute to a height of 10 m.take g = 10 m/s²?

Choose an answer

1000 liters

1200 liters

100 liters

2000 litre

The SI units of impulse are

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Nm

Nm²

Nm^-1

Ns

In the formulaα_amino= 1.22λ/D, D denotes

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Distance between source and the object

Diameter of lens

Power of the lens in Diopters

None of these

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

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters,then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

The optical fibre is covered for protection with

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rubber jacket

plastic jacket

steel jacket

copper jacket

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

The kinetic energy of a body is four times its momentum its velocity is

Choose an answer

2ms^-1

4ms^-1

8ms^-1

16ms^-1

Period of visible light waves is

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2 × 10^-10 sec

2 × 10^-11 sec

2 × 10^-14 sec

2 × 10^-15 sec

To get high resolving power for a telescope one should use

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Objective of large aperture

Objective of large focal length

Eye piece of large focal length

Eye piece of small focal length

If the tensile force is suddenly removed from a wire then its temperature will

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Decrease

Increase

Becomes zero

Remain constant

Crystal lattice is a repetition of

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Atoms

Molecules

Unit cell

All of them

The velocity of light in vacuum can be changed by changing:

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Frequency

Amplitude

Wavelength

None of these

The phenomenon of polarization proves that the light waves are

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Transverse wave

Longitudinal waves

Stationary waves

None of these

The dimensions of Young's Modulus are

Choose an answer

[ML^-1T^-1]

[ML^-1T^-2]

[MLT^-2]

[ML^-2T^-1]

The speed of swimming of porpoise is

Choose an answer

5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

A wave which consists of a single, non-repetitive disturbance is called a

Choose an answer

Continuous wave

Longitudinal wave

Pulse

Transverse wave

Which of the following is an example of Brittle substances?

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Copper and Brass

Brass and glass

Copper and glass

Only glass

The value of young modulus in Nm^-2for water is

Choose an answer

70 x 10

2.2 x 10⁵

Zero

None of these

In Young's double slit experiment,the separation between the slits is made 3 fold the fringe width becomes

Choose an answer

1/3 times

1/9 times

3 times

9 times

For fast moving particles, such as atomic particles in an accelerator, the following branch of physics is applicable

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newtonian mechanics

classical mechanics

relativistic mechanics

all of them

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

Choose an answer

energy bands

energy shells

states

all of them

If the power of a lens is 4 diopters then is focal length is

Choose an answer

20 cm

25 cm

50 cm

400 cm

An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as

Choose an answer

magnetic

magnetic dipole

magnetic monopole

none of them

The simplest type of rectification known as half wave rectification is obtained by

Choose an answer

Using a transistor

Suppressing the harmonics in A.C. voltage

Suppressing half wave of A.C. supply by using diode

Using a Coolidge

The velocity v of a particle at time t is given by:

v = at + b/t + c

The dimensional formula of a, b and c care respectively:

Choose an answer

L²;T and LT²

LT²; LT and L

LT²; L and T

L;LT and T^-2

If rope of lift breaks suddenly,The tension exerted by the surface of lift is (a = Acceleration of lift)

Choose an answer

mg

m (g + a)

m (g - a)

0

If a light of λ = 588 nm falls on half silvered glass plate in Michelson s interferometer if movable mirror is moved through 0.233 mm the number of fringes will be observed to shift

Choose an answer

795

792

786

None

The light signals are sent from the source

Choose an answer

A ordinary source

A monochromatic light source

A moulticolour source

None of these

The approximate efficiency of fossil fuel power plants is

Choose an answer

20 - 27%

30 - 40%

40 - 50 %

40 - 42%

A typical diffraction grating has lines per centimeter

Choose an answer

10 to 100

100 to 1000

1000 to 5000

400 to 5000

Acceleration is a physical quantity which is

Choose an answer

Scalar quantity

Vector quantity

Constant quantity

None of these

The derived unit of pressure is

Choose an answer

kg/Ns

kgm²/s²

kg/m²s²

kg/ms²

A pulse of light in the optical fibres represents the number

Choose an answer

0

1

2

3

The moment of linear momentum of a body is called

Choose an answer

Angular momentum

Couple

Impulse

Torque

In a simple microscope if the final image is located at infinity then its magnifying power is

Choose an answer

25/f

25

f/25

[1 + (25/f)]

Smaller the least count of the instrument more is the measurement

Choose an answer

Accurate

Precise

Accurate and precise

None of these

When a gas is compressed:

Choose an answer

Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

A boy walks uniformly along the sides of a rectangular park of size 400 m x 300 m.starting from one corner to the other corner diagonally opposite.Which of the following statements is incorrect?

Choose an answer

He has traveled a distance of 700 m

His displacement is 700 m

His displacement is 500 m

His velocity is not uniform throughout the walk.

Laws of motion are valid in a frame which is

Choose an answer

Uniform motion

Inertial

Both a and b

None of these

A positive charge is moved from a low potential point (A) to a high potential point (B) Then the electric potential energy

Choose an answer

Increases

Decreases

Will remain the same

Nothing definite can be predicted

A 500 kg car takes a round turn of radius 0 m with a velocity of 36 km/h.The centripetal force is

Choose an answer

250 N

750 N

1000 N

1200 n

You are on a frictionless horizontal plane.How can you get off if no horizontal force is exerted by pushing against the surface?

Choose an answer

By jumping

By spitting or sneezing

By rolling your body on the surface

By running on the plane

Moment of inertia of a sphere is

Choose an answer

1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

Why the toner is given a negative charge to the drum

Choose an answer

To spread over the drum

To stick the writing

To neutralize writing

None of these

A diode characteristics curve is a graph plotted between;

Choose an answer

Current and time

Voltage and time

Voltage and current

Forward voltage and reverse current

The resolving power of human eye is

Choose an answer

1°

2°

3°

6°

Huygen's principle states that:

Choose an answer

Light travels in straight line

Light has dual nature

Either of these

None of these

Pressure may be defined as_____per second per unit area:

Choose an answer

Change in force

Change in momentum

Change in energy

Work done

Which one of the following has only bulk modulus?

Choose an answer

Diamond

Glass

Tungsten

Water

Everything in the vastness of space is in a state of

Choose an answer

Rest

Motion

Perpetual motion

None of these

A result of the Bernoulli's equation is that the pressure will be low where the speed of the fluid is

Choose an answer

Low

High

Very high

None of these

The ratio of nuclear magneton and and Bohr magneton is

Choose an answer

m_e/m_p

m_p/m_e

m_e/m_p

2m_p/m_ez

The substances in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero, are called

Choose an answer

diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The maximum wavelength of a transverse wave that can be set up in a string of length Lis

Choose an answer

L

2L

V

4L

A ball is thrown with a speed of 30 ms^-1_{in a direction of 30}° with the ground. What will be its time of flight?

Choose an answer

3.1 s

1.55 s

0.31 s

15.5 s

One degree of thermodynamics scale of temperature is called:

Choose an answer

Celsius

Fahrenheit

Kelvin

Radian

The dimensions of intensity of energy are

Choose an answer

MLT⁺²⁷T¹

MLT²T²

ML³

MLT^-2T³

The entity which measures the quantity of motion in a body is called

Choose an answer

force

energy

momentum

power

Velocity is a

Choose an answer

Scalar quantity

vector quantity

constant quantity

none of them

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

Choose an answer

Space time

Straight space time

Curved space time

All of these

A geometric shape of a solid obtained by regular, respetive, three-dimensional arrangements of its molecules,atoms or ions is called a:

Choose an answer

Crystal

Crystal Lattice

Crystal plane

None of these

The dimensions of velocity are

Choose an answer

[ LT ]

[ LT²]

[ LT^-1]

[ LT^-2]

Interference and diffraction confirm:

Choose an answer

Particle nature

Wave nature

Dual nature

None of these

Coulomb's force is also

Choose an answer

Single force

Mutual force

Self force

None of these

1 torr = ______

Choose an answer

1.20 Nm^-2

1.38 Nm^-2

1.33 Nm^-2

1.31 Nm^-2

In Michelsion's interoferometer, if the moveable mirror is moved through a distance 0.05 mm and 500 finges are observed, then the wavelength of light used is

Choose an answer

1 x 10^-7m

2 x 10^-7m

1.5 x 10^-7m

1 x 10^-8m

The charges are attracted when

Choose an answer

Two charges are alike

Two charges are opposite

All of them

None of these

A snooker ball moving with velocity v collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is

Choose an answer

Zero

Infinity

V

2 V

The value of g at the center of earth is:

Choose an answer

Double

Zero

10 time larger than earth

Infinite

In a couple, the resultant of two forces is

Choose an answer

2F

F

F / 2

Zero

If the path difference must be an integral multiple of wavelength

Choose an answer

sin θ = md/λ

d sin θ = mλ

d sin θ = m/λ

d sin θ = λ/m

The original source of hydroelectric is

Choose an answer

Water

Wind

Sun

Moon

The force which aries when one layers of liquid slides over another layer is measure by

Choose an answer

Viscosity

Velocity

Momentum

Acceleration

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

Choose an answer

25W

75W

50W

100W

Curie is the unit of

Choose an answer

decay constant

activity

half-life

average life

Ordinary light has components of vibration in

Choose an answer

One direction

Different direction

All directions

None of these

Power is defined as

Choose an answer

P = ΔV/Δt

P = ΔW/Δt

P = mV/t

P = mt/V

Ratio of dimensions of power and K.E is

Choose an answer

1 : 1

T : 1

1 : T

M : T

The results of mechanical tests are usually expressed in terms of

Choose an answer

stress

strain

stress and strain

neither stress nor strain

The setting of Newton's rings is

Choose an answer

A Plano convex lens and the plane glass plate

A Plano convex lens and simple glass sheet

A Plano convex lens (long focal length) and the plane of glass plate

None of these

It is a common characteristic of all types of wave motion that

Choose an answer

Particles move up and down

Particles move back and forth

Energy is transferred without the transport of particles

A material medium transmits the disturbance

The heart of machine is

Choose an answer

Lamp and camera unit

Aluminium drum

Charging unit

All of them

A liquid flows through a pipe of non-uniform cross-section. If A1 and A2 are the cross-section of the portions of the pipe at two points the ratio of velocities of liquid at these points will be

Choose an answer

A₁A₂

A₁/A₂

1/A₁A₂

A₂/A₁

The ratio of diameters of two convex lenses is ______ the ratio of their focal lengths

Choose an answer

Greater than

Less than

Equal to

Square of

In a compound microscope the intermediate image is

Choose an answer

Virtual erect and magnified

Real,erect and magnified

Virtual,inverted and magnified

Virtual,erect and reduced

Two charges are placed a certain distance apart in air. When a metallic sheet is placed between them the electric static force between them will

Choose an answer

Decrease

Increase

Remains unchanged

Become zero

If a body starts from rest and travels 120 cm in the 6^th second then what is the acceleration?

Choose an answer

0.20 m/s²

0.027 m/s²

0.218 m/s²

0.03 m/s²

A 5 kg weight is accelerated from rest to 60 m/s in 1 sec What force acts on it

Choose an answer

5 x 60 N

(5/60) x 981 N

(60)² x 52 N

(5/2) x 60² x 981 N

A device which is based upon the thermodynamic property of matter is

Choose an answer

Thermometer

Thermo state

Heat engine

Calorimeter

The velocity of rain drop attains constant value because of

Choose an answer

Surface tension

Upthrust of air

Viscous force exerted by air

Air currents

Light has:

Choose an answer

Wave nature

Particle nature

Dual nature

None of them

The artillery shells travels along parabolic paths under the influence of

Choose an answer

magnetic field

electric field

electromagnetic field

gravitational field

Where in standing wave, do the vibrations of the medium occur?

Choose an answer

Only at the nodes

Only at the antinodes

At all points between the nodes

At all points between the antinodes

The SI units of the intensity of light are

Choose an answer

Lux

candela

Pois

None of these

A bomb of mass 12 kg initially at rest explodes into two pieces of masses 4 kg and 8 kg.The speed of the 8 kg mass is 6 ms^-1,The K.E of the 4 kg mass is

Choose an answer

32 j

48 j

114 j

288 j

The escape velocity of Uranus in Kms^-1

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22.4

23.07

24.09

24.5

Geothermal energy can be obtained from the heating rocks by the

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Igneous rocks

High temperature water

Decay of radioactive element

All of these

Torque is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

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

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

Bulk modulus is involved when the deformation is

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One dimensional

Two dimensional

Three dimensional

All of these

The velocity of a body at some particular instant is called

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Initial velocity

Instantaneous velocity

Variable velocity

None of these

The dimensions of expression V_f = V_i + at. Taking the R.H.S

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[LT]

[LT²]

[LT^-1]

[LT^-2]

Even the small viscosity of the air causes a retarding force on car at high speed is

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Small

Large

Very large

None of these

The working of carburetor of a car uses

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Gravitational law

Equation of continuity

Bernoulli's theorem

Stock's law

The object is placed at the principle focus of a simple microscope if the focal length of the lens is 2cm what is the magnifying power of the microscope

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13.5

12.5

Infinity

None of these

How many wavelengths of Kr⁸⁶ are these in one metre?

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1553164.13

1650763.73

2348123.73

652189.63

In conductors, the valence band and conduction bands are

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Touch each other

Overlapped each other

Largely overlapped

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 domains are the small regions of the order of

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Millimeter

Micrometer

Micron

None of these

The percentage uncertainty in measuring the volume of sphere measured by calipers callipers is when r = 2.25 ± 0.01 cm with least count ± 0.01 cm

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46.7 ± 0.5 cm²

47.7 ± 0.5 cm³

47.7 ± 0.6 cm³

477.6 ± 0.6 cm³