Question # 1

Which of the following type of force can do no work on the particle on which it acts:

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Frictional force

Gravitational force

Electric force

Centripetal force

Wave length of light, on the average, is given by:

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10^-14_m

10^-10_m

10^-6_m

10^-4_m

The term drift velocity is used when the ends of a wire are:

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Connected to a laser source

Connected to a voltage source

Not connected to a voltage source

At different values of potential

Both (B) and (D)

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

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outwards

inwards

in either way

none of these

The SI unit of spring constant is identical with that of

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Force

Surface tension

Pressure

Loudness

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

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-10 N

+10 N

+20 N

-20 N

When a water droplet falls through air, the net force on it is

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Net force = drag force - weight

Net force = weight - drag force

Net force = drag force + weight

Net force = weight + drag force

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

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I_cwill decrease

V_CEwill increase

I_Cwill increase

V_CCwill increase

A mental wire is stretched by suspending weight to if x is the longitudinal strain and y is young s modulus of elasticity then the elastic potential energy per unit volume is

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1/2 y x²

x² / 2y

y² / 2x

x² / 2y

When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:

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Increases by one

Decreases by one

Remains the same

Decreases by four

The expression for the maximum height is

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Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively.Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

their time of flight will be same

An Earth satellite in a circular orbit of 384000 km. What is its velocity in that orbit take me = 6.0 × 1024 Kv R_e = 64000 km

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2.57 kms^-1

1.1 kms^-1

1.01 kms^-1

1.07 kms^-1

Maximum number of orders available with a grating is ______ grating element

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Independent of

Directly proportional to

Inversely proportional to

Equal to

Slope of displacement time graph gives

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Instantaneous velocity

Instantaneous acceleration

Work done

Force

In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased

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Number

K.E

P.E

Frequency

Minimum number of unequal forces whose vector sum can be zero is

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3

4

2

5

The unit of power is

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Erg

KW

Watt

both B and C

The property due to which the size or shape of a lattice is not important is called

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Cleavage

Anisotropy

Homogenity

None of these

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