Question # 1

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

When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

In photoelectric effect the energy of ejected electrons depend on

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The frequency

The intensity

Both frequency and intensity

None of these

Which quantity has different dimension?

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Tension

Work

Energy

Torque

The distance covered by the wave during one period is called its:

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Wave number

Frequency

Wavelength

Time period

The cause of mirage observed in deserts in bright sunlight is due to

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

The SI unit of permitivity is

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Nm²C²

N^-1m^-2C²

NmC²

Nm²C^-1

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

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RMS value

Instantaneous value

Valued average over a cycle

Zero

Both (B) and (C)

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

The dimensions [MLT^-2] refer to the quantity

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Acceleration

Velocity

Force

Momentum

Which of the following have maximum ionization power?

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𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

For single slit diffraction the first minimum occurs when

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dsinθ = λ

dsinθ = λ/2

dsinθ = 2λ

dsinθ = mλ

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

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

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Inertial frame

Non-inertial frame

Every frame

None of these

Conventionally, all the distances p, q, f, are measured from ______ of the lens

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Focus

Optical center

Edges

Centre of curvature

The typical speed of 100 meters dash

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2 ms^-1

4 ms^-1

10 ms^-1

12 ms^-1

An inertial frame of reference in which acceleration is

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Very high

Very very low

Zero

None of these

If the velocity of a body becomes double and mass becomes half then its K.E

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Becomes double

Becomes four times

Is halved

Becomes eight times

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

The unit of surface energy per unit area may be expressed as

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Nm^-2

Nm^-1

Nm

Nm²

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