Question # 1

All divers need to wear seat belt because of effect of:

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Air resistance

Tensional

Push force

Gravitational

The number of base units in SI are.

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3

6

7

9

1000 liters is equal to:

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100 m³

1 m³

1 cm³

1 mm³

Newton's law of gravitation resembles with

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1st law of motion

2nd law of motion

3rd law of motion

Law of gravitation

If the mass of a body is 'm' and change in its temperature isΔT, then the heat absorbed or released is given by

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ΔQ = cmΔT

ΔQ = mΔT

ΔQ = 2cΔT

ΔQ = cmΔT2

Which gas is used inspite of Freon gas in refrigerator?

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CO₂

H₂

NH₃

N₂

Thermal conductivities of Lead

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23

30

35

85

S.I unit of gravitational field strength is:

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Nkg

Nkg^-1

Nkg^-2

Nkg^-3

The machine which use unequal masses to find the value of "g" is ________

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Free fall apparatus

Atwood machine

Pulley

None

The unit of electric charge is

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Ampare

Joule

Coulomb

Volt

The unit of acceleration is.

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ms-1

ms

ms^-2

ms²

The S.I unit of intensity of sound is:

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Wm

Wm2

Wm-2

Wm-1

Unlike charges always:

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Repel each other

Attract each other

Sometimes repel and attract each other

Both A and B

1.6x10^-19 J= :

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1F

1N

1eV

Level of noise recommended in eight, hour work day:

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80-90 dB

80-85- dB

85-90 dB

90-95 dB

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

The loudness of sound is most closely related to its:

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Freqeucy

Period

Wavelength

Amplitude

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

the motion in which the friction reduces the mechanical energy of the system as time passes and the amplitude of motion reduces is called:

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SHM

Random motion

Damped motion

Circulatory motion

In simple pendulum motion, restoring force is provided by:

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Air resistance

Tension in the string

Inertia

Weight of the body

Which types of image is produced by the converging lens of human eye if it view a distant object?

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Real , erect, same size

Real, inverted, diminshed

Virtual, erect,diminshed

Virtual, inverted, magnified

After refraction from a convex lens, rays of light parallel to the principal axis converge at a point, this point of convex lens is called:

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Principal focus

Pole

Focal length

Optical center

In case of point source the shape of wave front is.

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Plane

spherical

Circular

Eliptical

The dimension of power is

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MLT-1

ML2T-2

ML2T2

ML2T-3

SI units of time was redefined in

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1900

1967

1960

1983

the length of simple pendulum of time period 1 second is

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2 m

1 m

0.5

0.25 m

In case of planets centripetal force is provided by

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Coulomb's force

Electrostatic force

Gravitational force

Magnetic force

The frictional effect between the different layers of fluid is called

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Terminal velocity

Stock's law

Viscosity

Surface tension

If an object is placed with in the focal length of a convex lens, its image is formed.

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Real

Inverted

Virtual

Smaller than object

Work is negative when angle between F and d is

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45^o

₀^o

90^o

180^o

Artificial gravity can be created in the space ship by

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Revolving around the earth

Spinning around its own axis

Increasing its velocity

Decreasing it svelocity

A spring has a spring constant k. If it is cut in two equal parts, the spring constant of each part will be

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K

2 K

K/2

4K

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

The first orbit in the hydrogen atom has a radius.

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0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹