Question # 1

41 The force experience, when proton projected in a magnetic field with velocity 'v' is

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+e(v x B)

-C(V x B)

+e²(v x B)

-e(v²x B)

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

The device which allows only the flow of an A.C. through a circuit is

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Capacitor

Inductor

D.C. motor

Battery

.Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

Significant figures in 0.2020 are:

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Two

Three

Four

Five

A flowing liquid possess

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K.E

P.E

Pressure Energy

All

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

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

Maximum height of a bullet when fixed at 30 with horizontal is 11 m. Then height when it is fired at 60° is

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22 m

6 m

33 m

7.8 m

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

The dimensions of torque is

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[MLT^-2]

[ML²T^-2]

[ML²T^-1]

[MLT]

Numerical value of magnitude of a physical quantity is

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Independent of system of units

Directly proportional to magnitude of the unit

Inversely proportional to magnitude of the unit

Either (B) or (C)

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

The SI unit of stress is same as that of.

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Momentum

Pressure

Force

Length

The distance from Earth to Sun is

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10⁹ m

10⁸ m

10¹⁰ m

10¹¹ m

The escape velocity of a body depends upon

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The mass of the body

The mass of the planet

Volume of body

Density of body

Super conductors are materials like

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Alloys

Ceramic

Semiconductors

a and b

Polaroid glass is used in sun glasses because

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It is fashionable

It has good color

It is cheaper

It reduces the light intensity to half on account of polarization

A ballistic missile is

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Unpowered

Unguided

Both

None of these

The term Brownian movement refers to

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Irregular motions of small particles suspended in a fluid

Convection currents in a liquid or gas

Convection currents in a gas but not in a liquid

The stretching of a body beyond its elastic limit

If 'd' is the total displacement of the body in time 't' then the velocity during this interval t is

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Initial velocity

Variable velocity

Average velocity

None of these

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