Question # 1

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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a reversible process

an irreversible process

any one of them

both of them

If F=0.04 N and X=4 cm then K=

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1 Nm^-1

2 Nm^-1

3 Nm^-1

4 Nm^-1

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

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

Neutron was discovered in

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1915

1920

1925

1932

Slope of velocity time graph represents:

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Acceleration

Speed

Torque

Work

An inkjet printer uses in its operation:

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Neutrons only

Mesons only

Positrons and photons

An electric charge

None of these

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

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

Body which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

In which process the condition for the application of Boyle's law on the gas is fulfilled

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isochoric process

adiabatic process

isothermal process

none of them

Heating effect caused by an electric circuit is written

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H = I²Rt

H = I²R

H = IR²t

H = IR²

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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maximum frequency

minimum frequency

threshold frequency

all of these

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

S.I. unit of planks constant is

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J-s^-1

J.s

J.s^-2

J.s²

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

An object moving through a fluid experiences a retarding force called a

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frictional force

terminal force

opposing force

drag force

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

G.P. Thomson observer experimentally that electrons and neutrons possess

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particle-like properties

wave-like properties

neither particle nor wave like properties

none of these

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

Deep water almost runs still when surface water flow in rivers. What does it explains

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Magnus effect

Equation of continuity

Surface energy

Bernoulli's equation

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

Photoelectric effect takes place with a photon of:

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Very high energy

Very low energy

Low energy

High energy

None of these

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

The SI unit of charge is

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Ampere

Watt

Coulomb

Volt

Joule

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