Question # 1

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

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0.1 V

8 V

2 V

0.5 V

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

Amorphous solids are also more like

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crystalline solids

gases

liquids

any one of them

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

The string of a simple pendulum should be:

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Heavy

Extensible

In-extensible

None of these

The instrument which detects the instant at which external pressure becomes equal to the systolic pressure is

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stethoscope

thermometer

manometer

barometer

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

0.1 kg mass will be equivalent to the energy

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9 x 10¹⁵J

5 x 10⁸J

6 x 10¹⁶J

9 x 10^-16J

Which of the following waves are more energetic

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radio waves

infrared waves

ultraviolet

γ-rays

Even the small viscosity of the air causes a retarding force on car at high speed is

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Small

Large

Very large

None of these

Reduce the following figure up to three significant figure 64.4567

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64.5

64.4

64.3

None

Which one of the following is polymer

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Polythene

Polystyrene

Nylon

All

The fringe spacing in case of blue light

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Increases

Remains the same

Decreases

None of these

The maximum range of the projectile is the horizontal distance covered is

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Maximum

Distance

Minimum

None of these

An inertial frame of reference is that frame of reference in which

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a = 0

a > 0

a < 0

all of them

Velocity is a

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Scalar quantity

vector quantity

constant quantity

none of them

Find the average speed of oxygen molecule in the air at S.T.P

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591 ms^-1

461 ms^-1

396 ms^-1

372 ms^-1

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

The mother and daughter elements with the emission of 𝖰 − 𝒓𝒂𝒚𝒔, are called:

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Isotopes

Isobars

Isomers

Isodiapheres

If the wavelength of light used in Michelsion's interferometer is 400 nm and the moveable mirror only moved throughλ/4, then the length moved will be

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10 nm

10^-2mm

1 nm

10^-4mm

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