Question # 1

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE + PE remains constant

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart. with force of repulsion between the spheres to be 10^-19 N is

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25

225

625

1250

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

Which of the following is equal to:

joule x ohm / volt x second ?

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Ampere

Volt

Watt

Tesla

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

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

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both (A) and (B)

None of these

The half life of a radio-isotope is 5 years The fraction of atoms decayed in this substance after 15 years will be

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1

3/4

7/8

5/8

The primary winding of transformer has 500 turns whereas its secondary has 5000 turns The primary is connected to an a.c supply of 20 V, 50 Hz The secondary will have an output of

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200 V, 50 Hz

2 V, 50 Hz

200 V, 500 Hz

For obtaining appreciable extension, the wire should be

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Short and thin

Long and thin

Short and thick

Long and thick

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

Which of the following is the only vector quantity?

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Temperature

Energy

Power

Momentum

A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

The angle between rectangular components of a vector is

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0°

60°

90°

120°

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

The average binding energy of a nucleus inside an atomic nucleus is about

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8 MeV

8 eV

8 Joules

8 ergs

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

If the metal bob is a simple pendulum is replaced by a wooden bob, then its time period will

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Increas

Decreases

Remain the same

First A then B

When sound waves travel from air to water which of these remains constant?

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Velocity

Frequency

Wavelength

All the above

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