Question # 1

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Torque is a vector quantity

Torque is the turning effect of a force

Torque is called moment of a force

All of above

The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

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F=eVB

F=e²V/B

F=e/VB

F=B²/ev

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

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

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Unity

Infinity

Zero

-Fd

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

If electric and gravitational force on an electron in a uniform electric field will be

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E=mg/q

E=q/mg

E=,g/q

E=qg/m

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

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Is associated with coil P

Is associated with coil S

Causes an induced current is coil S

All of these

None of these

All trigonometric functions (sine, cosine, tangent etc) are positive in:

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1st quadrant

2nd quadrant

3rd quadrant

4th quadrant

Compton shift refers to:

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Photon

Meson

Proton

Positron

Both (B) and (D)

Magnetic flux and flux density are related by

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Flux density = flux x area

Flux density = flux / area

Flux density = flux - area

None of these

The critical temperature of mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

The discuss used by athlete has a mass of 1 kg, its weight in newton is

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9.8 N

80 N

98 N

100 N

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

In a transistor, the central region is called

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collector

emitter

base

none of them

For transmission of both transverse and longitudinal waves, we can use:

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Solid

Gas

Plasma

None of these

The strength of magnetic field around the current conductor is

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Smaller near the conductor

Greater near the conductor

Greater at the large distance from the conductor

Constant near and away from the conductor

The conventional current is the name given to current due to flow of:

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Positrons

Positive charges

Negative charges

Both (A) and (C)

None of these

Max Planck received the Nobel Prize for his discovery of energy quants in:

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1718 AD

1918 AH

1818 AD

1918 AD

None of these

When a water droplet falling freely through air, the drag force on water droplet increases with th

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decrease in speed

increase in speed

pressure

none of them

To see the minor details of the object by microscope, it should have:

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High magnifying power

High resolving power

Am objective of larger focal length

None of these

An emf is set up in a conductor when it:

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is kept in a magnetic field

is kept in a electric field

Move across a magnetic field

Both (A) and (B)

None of these

Resistance is measured in

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volts

ampere

ohm

watt

The waves in which the particles of the medium are displaced in a direction perpendicular to the direction of propagation of waves are known as

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longitudinal waves

transverse waves

non-mechanical waves

none of them

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

As the light shines on the metal surface, the electrons are ejected

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slowly

instantaneously

either of these

none of these

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