Question # 1

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

A car is turning around a corner at 10 m/sec as it travels along an arc of circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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1 m

5 m

10 m

15 m

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

The angle which specifies the instantaneous value of the alternating voltage or current is called

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phase

critical angle

angle of incidence

all of these

Which waves are used in sonography?

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Microwaves

Infra red waved

Sound waves

Ultrasonic waves

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tnesion

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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Wien's constant

Stefen's constnat

Planck's constant

Boltzmann's constant

None of these

The value of threshold frequency for different metals is

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different

same

may be different or may be same

none of these

Ohm is the unit of

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current

capacitance

energy

resistance

If a force of 0.05 N produces an elongation of 20 mm in a string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

In a simple microscope if the final image is located at infinity then its magnifying power is

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25/f

25

f/25

[1 + (25/f)]

The velocity of a body at some particular instant is called

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Initial velocity

Instantaneous velocity

Variable velocity

None of these

Two wires of the same material have diameters in the ration 2 : 1 if they are stretched by the same force their elongations will be in the ratio

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8 : 1

1 : 8

2 : 1

1 : 4

If radius of droplet is halved then is terminal velocity in viscous medium

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Doubles

Is halved

Becomes one fourth

Becomes four time

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

Why the toner is given a negative charge to the drum

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To spread over the drum

To stick the writing

To neutralize writing

None of these

The angular velocity of a particle rotating in a circular orbit 100 times per minute is

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1.66 rad/s

10.47 rad/s

10.47 deg/s

60 deg/s

The amorphous material (solids) have

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No structure

No melting point

No definite shape

All of them

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

A hollow insulated conduction sphere is given a positive charge of 10μC.What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

Change in momentum per second is:

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Product force and time

Product of pressure and area

Ratio of pressure and area

None of these

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