Question # 1

An other name for electric P.E per unit charge is.

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Electric intensity

Electric field

Electric potential

Electric force

The gravitational strength on the surface of moon is 1.6 N kg-1 What will be the mass and weight of an object respectively on the surface of the moon.

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10 kg , 1.6 N

10 Kg , 16 N

16 Kg, 10 N

16 kg, 160 N

The centre of gravity of an object is also called.

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Centre of buoyancy

Centre of mass

Centre of the body

Torque

If the temperature of the source and sink are increased by same amount the efficiency of the engine.

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Increases

Decreases

Remains unchanged

May increases of decrease

Among different elements of the periodic table which of the following atoms is the simplest.

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Carbon

Oxygen

Hydrogen

Nitrogen

The pascal is not the SI derived unit of.

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Pressure

Stress

work

Tensile strength

The unit generally used for measuring astronomical distances is.

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Parsecs

Light year

Metre

Kilometer

A dry battery can deliver 3,000 J energy to a small 2 W electric motor before the battery is exhausted for how minutes does the motor run.

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20 minutes

25 minutes

75 minutes

125 minutes

Which is the best sound source to produce a pure note.

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Tuning fork

Flute

Drum

Harmonium

When a charged rod is brought near bits of dry cork dust The dust will.

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Cling firmly to rod

Be replied from the rod

Attract itself to the rod a first and then fly off

Be repelled at first and then be drawn to the rod

Which animal did Erwin Schrodinger contemplate using in his famous thought experiment.

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mouse

Cat

Dog

Rabbit

If the K.E. of a body becomes 4 times of its initial value, the new momentum will be

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half

Same

Double

4 times

Polarization is characteristic of.

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Light wave

sound waves

Waver waves

x-rays

The pressure of a gas is directly proportions to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

Diffraction is a special type of.

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Polarization

Interference

Dispersion

Scattering

All the magnetic materials lose their magnetic properties when

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Dipped in oil

Dipped in water

Heated

Cooled

In L - C parallel circuit the coil draws a.

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Lagging current

Leading current

Lagging voltage

Leading voltage

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

If a capacitor is charged by using a 1.5 V battery, how much charge will capacitor gain.

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0 V

0.5 V

1.5 V

3 V

A heat engine with 100% efficiency would have to.

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Do no work

Be at uniform temperature

Use no heat

Discharge of 0 ^oC

Which of the following quantities is discrete according to Bohr's hypothesis.

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Momentum

Potential energy

Angular velocity

Angular momentum

the depth of a pond is 4 m What is the apparent depth of the pond if the water level is 3.5 m high. The refractive index of water is 1.33

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1.9 m

2.3 m

3.13 m

4.5 m

The resolving power of an instrument increases as the wavelength of light used decreases, the magnifying power will

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Remain the same

Increases

Decreases

Have no relation between the two

If a wave vibrate 10 times in 1 s with a speed of 10 m s-1 the correct wavelength of the wave is.

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1 m

10 m

20 m

100 m

Ultrasonic sound waves

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Can be heard by a normal human ear

Can be heard with the help of hearing apparatus

Can be heard with the help of microphone

cannot be heard

A forward based p-n semiconductor diode is called.

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Photodiode

Photovoltaic cell

Amplifier

Ligh emitted diode

Equipotential surfaces in an electric field are always.

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Spherical

Closed surfaces

Tangent to electric lines of force

Perpendicular to electric lines of force

In case of a convex lens the rays closed to and parallel to the principal axis will converge after refraction by the lens at a point.

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Optical centre

Principal focus

Focal plane

Principal axis

A light beam is said to be plane polarized when

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its vibrations are restricted to only one plane

Its vibrations are very strong in one plane

Its vibrations take place in any plane

Its vibrations are very weak in one plane

In case of a convex lens when object is placed at 2F image is formed.

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At

2F

away from 2F

Between F at and 2 F

LED is a p-n junction that emits

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Visible light

X- rays

Ultraviolet light

electromagnetic waves

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