Question # 1

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

The device which can convert heat energy into electrical energy is called:

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Thermistor

Thermometer

Thermostat

Thermocouple

Both (C) and (D)

The positron was discovered by:

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In cosmic radiation

In 1932

By Carl Anderson

All above

By direc

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

In the formula for finding the speed of waves in the spring, unit of m in SIn units is:

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kg

kg-meter

kg/meter

Meter/kg

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

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Velocity

Frequency

Wavelength

All the above

When weight of an object falling freely becomes equal to the drag force, then the body will move with

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increasing speed

decreasing speed

constant speed

none of them

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

When two waves with same frequency and constant phase difference phase difference interfere

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There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

The maximum drag force on a falling sphere is 9.8 N, it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

Which one of the following is an example of SHM

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Motion in a plane

Motion in a swing

Motion in a car

None of these

The charged nucleus of an atom itself spins its magnetic field is

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Equal to the field produced by orbital electrons

Greater than the field produced by orbital electrons

Much weaker than the field produced by orbital electrons

Very strong

The ability of anybody to return, to its original shape is called

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Elasticity

Elastic force

Stress

Strain

In petrol engine, the fourth stroke is the

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Power

Compression

Exhaust

None of these

A car moves for half of its time at 80 km/h and for rest half of time at 40 km/h.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

The value of Faraday number is SI unit is

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9.65 Coulomb/kg/equivalent

9.65 x 10⁷Coulomb/kg/equivalent

9.65 x 10^-7Coulomb/kg/equivalent

9.65 Coulomb/kg/equivalent

The Physical quantity which has the dimensional formula M¹T^-3 is

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Surface tension

Solar constant

Density

Compressibility

In SI system the correct unit of amount of substance is

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Litre

Mole

Millilitre

Gram

An un-power and un-guided missile is called a

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rocket

ballistic missile

guided missile

none of them

The approximate efficiency of steam locomotive is

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8%

9%

10%

11%

The moment of linear momentum of a body is called

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Angular momentum

Couple

Impulse

Torque

If an electron vertically downwards, then the horizontal component of the earth’s magnetic field will deflect it to wards

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West

East

North

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