Question # 1

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

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0 J

2 J

5 J

10 J

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

A typical four stroke petrol engine undergoes how many successive processes in each cycle

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one

two

three

four

The total energy of spring mass system is

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zero

changing with time

constant

none of them

No spark plug is needed in

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petrol engine

diesel engine

both of them

none of them

de-Broglies hypthesis was experimentally verified by

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Maxwell

Compton

Einstein

Davison and Germer

Resonance occurs when one of the natural frequencies of vibration of the forced or driven harmonic oscillator

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greater than the frequency of applied force

equal to the frequency of applied force

less than the frequency of applied force

all of them

Tesla is the unit of

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Magnetic induction or flux density

Magnetic flux

Self inductance

None of these

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The waves which propagate out in space due to oscillation of electric and magnetic fields are known as

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e.m. waves

mechanical waves

sound waves

water waves

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

The Dimension of Force is

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[MLT^-2]

[MLT²]

[ML²T^-2]

None of these

Direction of torque can be found out by

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head to tail rule

parallelogram rule

left hand rule

right hand rule

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

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Resolving power

Magnification

Power

None of these

A PN junction diode cannot be use:

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As rectifier

For converting light energy to electrical energy

For getting light radiation

For increasing the amplitude of an ac signal

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

In launch mass of the rocket fuel is

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70%

80%

More than 80%

None of these

Center of mass is a point

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Which is geometric centre of a body

From which distance of particles

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

The whole structure obtained by the repetition of unit cell is known as

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Unit cell

Crystal lattice

Ore

All of these

What is the weight of a 700 g of body on a planet whose mass is 1/7th of that of earth and radius is 1/2 of earth?

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400 gf

300 gf

700 gf

500 gf

Layer of oil on water in sunlight appears coloured due to

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diffraction of light

dispersion

interference of light

polarization of light

Torque is zero if

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Moment arm is zero

Body is at rest

Uniform angular acceleration

None of these

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