Question # 1

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

Which of the following is an example of SHM(in ideal situations)

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Motion of simple pendulum

Motion of horizontal spring man system

Motion of violin string

All of these

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

Compton studied the scattering of x-rays by loosely bound electrons from:

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NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

1 gm-cm^-3is equal to

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10³kg-m^-3

10^-3kg-m^-3

1kg-m^-3

10⁶kg-m^-1

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

Which quantity has different dimension:

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Work

Pressure

Energy

Torque

The phenomenon of generation of induced emf is called

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Electrostatic induction

Magnetic induction

Electromagnetic induction

Electric induction

Both (A) and (D)

Period of vibration of an atom in a solid is

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1 × 10^-10 sec

_{1 × 10}^-13_sec

1 × 10^-16 sec

1 × 10^-19 sec

A frame of reference stationed on Earth is approximately an example of

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Inertial frame

Non-inertial frame

Every frame

None of these

A snooker ball moving with velocity v collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is

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Zero

Infinity

V

2 V

S,I unit of magnetic flux is

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Weber metre^-2

Weber

Weber per metre

Weber per metre⁴

No of spark plugs needed in diesel engine is:

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Four

Five

Six

None of these

When the velocity of a body is decreasing, the acceleration produced is

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Positive acceleration

Negative acceleration

No acceleration produced

None of these

Substances which undergo plastic deformation until they break, are known as

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brittle substances

ductile substances

plastic substances

neither of them

The minimum number of unequal forces whose vector sum can be zero is

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3

2

1

4

At the maximum height the V_fis

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Constant

Zero

Maximum

None of these

In which process the change in internal energy of the system is zero:

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Isochoric process

Isobaric process

Adiabatic process

Isothermal process

Mathematically the first condition for equilibrium can be expressed as

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ΣF_x = 0

ΣF_y = 0

ΣFx = 0 and ΣF_y = 0

ΣFx = 0 or ΣF_y = 0

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