Question # 1

In a metal, the valence electrons are:

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Attached to individual atoms

Not attached to individual atoms

Free to move within the metal

Both A and B

Both A and C

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

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1 MHz

10 Hz

1 GHz

100000 Hz

In L.C.R series A.C. circuit, the phase angle between current and voltage is

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Any angle between 0 and +π/2

π/2

π

Any angle between 0 andπ/2

Michael Faraday and Joseph Henry belong respectively to

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USA and England

England and France

England and USA

USA and France

None of these

In the equation E=mc² value of c is?

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186000 miles per hour

186000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

Two sound waves of slightly different frequencies propagating in the same direction produce beats due to

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Interference

Diffraction

Polarization

Refraction

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B is correct

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

A body moves a distance of 10 m among a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with the direction of motion of a body is:

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0°

30°

60°

90°

The ability of body to return to its original shape is called

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Elasticity

Stress

Strain

Shear

The conventional source of energy is

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Geothermal energy

Solar energy

Hydroelectric energy

None of these

Weightlessness experienced by the spaceship is due to

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Absence of gravity

Absence of inertia

Free fall of spaceship

All of these

Shear modulus for lead is

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1.7

4.9

5.6

6.2

The direct conversion of sunlight into electricity through the use of semi conductor devices called

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Photo cell

Photo voltaic cell

Semiconductor diode

None of these

The SI unit of stress is

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Nm²

Nm

dynesm^-1

N

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

The kinetic energy acquired by a mass m in traveling a certain distance d.starting from rest. under the action of a constant force is directly proportional to

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√m

Independent of m

1 / √m

m

There are earth stations which transmit signals to satellites and receive signals via satellite from other countries are

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200

Over 200

400

500

The bending of light when it passes from one medium to another is known as

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Refraction

Interference

Polarization

Diffraction

When the shear stress and shear strain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

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