Question # 1

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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Increases

Decreases

Remain unchanged

Becomes infinite

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

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

The SI unit of charge is

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Ampere

Watt

Coulomb

Volt

Joule

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

Tick the correct statement:

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Both the potential and potential difference is scalars

Potential is a scalar but potential difference is a vector

Both are vectors

Potential is vector but potential difference is scalar

None of these

Resistance is measured in

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volts

ampere

ohm

watt

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 platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

Which of the following options correctly states the equation of continuity for an ideal fluid?

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A₁A₂= V₁V₂

A₁/A₂= V₂/V₁

A₁/A₂= V₁/V₂

none of the above

The blood pressure of a person

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decrease with age

increase with age

has no effect with age

none of them

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The time period of pendulums of different lengths would be

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same

different

both of them

none of them

The energy of a photon is represented by

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h/c²

h/T

hc²

hf/c²

Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

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Also 20º

70º

90º

180º

None of these

Heating effect of current utilized in:

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Electric motor

Electric toaster

Electroplating

Electric kettle

Both (B) and (D)

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

When the velocity of a liquid flowing steadily in a tube increases, its pressure?

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Decreases

Increases

Remains same

Zero

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

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

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

A current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

First law of thermodynamic is special case of

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Law of conservation of energy

Charle's law

Law of conservation of mass

Boyle's law

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

In a moving coil galvanometer, the deflecting couple depends upon

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area of the coil

number of turns of coil

value of magnetic field

all of the above

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