Question # 1

A bi prism consists of.

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Two parallel glass plates

Two acute angled prisms

Two obtuse angled prisms

Two right angled prisms

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

use of outer layer in optical fires called cladding is mainly to.

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Scatter thelight

Absorb unwanted light

Transmit the light

Produce total internal reflection

The patch followed by charge in an electric field is.

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Circular

LInear

Parabolic

Zig zag

The direction of induced emf during electromagnetic induction can be determined by making use of.

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Faraday's law

Ampere;s law

Lenz's law

Laplace law

The expression PV/KT represents.

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Number of moles of the gas

Number of molecules in the gas

Total mass of the gas

Density of the gas

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

With high frequencies capacitive reactance

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Increases

Decreases

Becomes double

Becomes half

To get large magnifying power of an astronomical telescope. we should have focal length of eye lens.

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Small

Large

Of any value

Infinity

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

In Isochoric process there is no

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Work done

Internal energy change

Volume change or work done

Heat exchanged

The aberration in the image formed by a lens due to different wavelengths present in a source is called.

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Spherical aberration

Chromatic aberration

Astigmation

Achromatic aberration

Which force pushes up a body in fluid

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Thrust

Lift

buoyant

Pressure

X-rays spectrum may be

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Continuous spectrum

Discontinuous spectrum

Line spectrum

Continuous and line spectrum

The SI unit of impulse is.

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N m

N s

Kg ms -1

Both b and c

In the experiment of production of X rays the anti cathode should be bombarded with.

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A particles

Beta particles

Electrons

Protons

In water drops rainbows are formed by

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Reflection

Refraction

Dispersion

All of these

Why a positively charged object is made neutral by someone touching it.

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Electrons flow from the object

Protons flow onto the object

Protons flow from the object

Protons flow onto the object

A leser beam may be used to measure very large distance because it is.

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Unidirectional

Cohernet

Monochromatic

Not absorbed

A diode cn be used as

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Amplifier

Rectifier

Oscillator

Transistor

What happens to a soap bubble, when some charge is given to it.

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It collapses

It increases in size

It decreases in size

It feels nothing

The wavelength of X-rays is of the ofder of.

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10^-14 m

10^-10 m

10^-9 m

10^-6 m

Which quantity remains fixed in isobars.

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Mass number

Atomic number

Number of neutrons

Number of protons

Which incapability of the materials is represented by the phenomenon of hysteresis.

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Magnetic saturation

Low susceptibility

Retrace the path

Orientation

Restoring force in the SHM is

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Centripetal

Frictional

Conservative

Non conservative

Which of the following is not essential for the free oscillations of a mass attached to a spring.

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Elasticity

Gravity

Inertia

Restoring force

A bat while flying determines the location and nature of object in his way by sending.

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Infrasonic waves

Ultrasonic waves

Supersonic waves

Ultraviolet waves

On which of the following the kinetic theory of gases is not applicable.

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Water vapour

Smoke particles

Bound particles

Free electrons

Which of the following phenomenon is explained by the tunnel efffect.

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Alpha decay

Beta decay

Gama decay

Radioactivity

When a point charge which is responsible for a force being exerted on another point charge is suddenly moved the second charge experience.

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Nor charge of force

An instantaneous change of force

A sudden change of force of some later time

an increase of its charge because of induction.

The point of which the whole weight of the body acts

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zero point

Centre of mass

Centre of gravity

Equilibrium

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