Question # 1

The ratio of the r.m.s value of the applied voltage to the r.m.s value of resulting a.c. is

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Impedance

Inductance

Reactance

Resistance

Which waves are used in sonography?

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Microwaves

Infra red waved

Sound waves

Ultrasonic waves

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

Relativistic mechanics is a branch of physics, which deal with the bodies moving with velocities:

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More then c

Approaching c

Equal to c

Much less than x

Distance traveled by a body falling from rest in the first, second and third second is in the ration of

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1 : 2 : 3

1 : 3 : 5

1 : 4 : 9

None of the above

Which one is the least multiple:

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Pico

Femto

Nano

Atto

Viscosity is defined as

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the friction between fluid and its container's walls

the internal friction between two layers of fluid

the resistance to flow a fluid experiences

the extent to which outside factors effect the fluid's flow

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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1 m

5 m

10 m

15 m

Another mean of electric potential energy per unit charge is given by:

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Electric intensity

Potential gradient

Electric Flux

Potential difference

None of these

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

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0.015 × 10^-3

0.019 × 10^-3

0.151 × 10^-3

0.0179 × 10^-3

Sunset makes sky appears reddish because of:

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Diffraction of sun rays

Refraction of light

Scattering of light from dust particles

Polarization of ligth

A lens of 2 cm focal length is to be used as a magnifying glass. Its magnification is

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13.5

12.5

0.5

2.5

The wavelength of refractive wave in a denser medium is

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Same as that of the incident wave

Become smaller than the incident

Becomes greater than the incident wave

None of these

Linear momentum is a vector quantity and has direction of

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Its displacement

Velocity

Acceleration

None of these

Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.

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Four , Six

One , four

two , five

None of these

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

If a particle covers half the circle of radius R with constant speed then

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Momentum change is mvr

Change in KE is 1/2 mv²

Change in KE is mv²

Change in KE is zero

SI unit of temperature

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Centigrade

Celsius

Kelvin

All of these

If 5000 lines/cm are ruled on a diffraction grating, the element is:

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5 x 10^-5m

2 x 10^-6m

5 x 10^-6m

2 x 10^-5m

Using a graded index fibres the time difference is reduced to about

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0.5 ns per km

1.0 ns per km

2.0 ns per km

2.3 ns per km

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