Question # 1

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

Which of the following forces is responsible for SHM

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Applied force

Restoring force

Fractional force

Elastic force

When a body moves along a circular path with constant speed, it has an acceleration, which is always directed

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Along the tangent

Towards the centre

Away from the centre

None of them

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

Which of the following is scalar quantity?

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Electric potential

Velocity

Momentum

Force

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

A simple pendulum consists of a

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small light bob

small heavy bob

big light bob

big heavy bob

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

The SI unit of spring constant is identical with that of

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Force

Surface tension

Pressure

Loudness

The useful unit of the angular displacement in SI unit is:

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Degree

Revolution

Radian

Metre

magnetic field is a:

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Vector quantity

Scalar quantity

Scalar as well as scalar quantity

Any of (A) or (B)

Neither (A) nor (B)

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

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outwards

inwards

in either way

none of these

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

1 gm-cm^-3is equal to

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10³kg-m^-3

10^-3kg-m^-3

1kg-m^-3

10⁶kg-m^-1

The absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

If the ends of a wire are connected to a battery an electric field E will be set up at:

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The ends of the wire only

Mid points of the wire only

Every point within the wire

At nodes only

Both (B) and (D)

A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

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Zero

10.2 J

100 J

980 J

A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s^s)

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9.8 m

14.7 m

4.9 m

19.6 m

How many isotopes of helium are present?

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1

2

3

4

The behaviour of gases is well accounted by the kinetic theory based on

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microscopic approach

macroscopic approach

both of them

none of them

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car?

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60 km/hr

80 km/hr

120 km/hr

180 km/hr

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