Question # 1

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

Which of the following is an electrical insulator that can be polarized by an applied electric field.

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Conductor

Condenser

Di electric

Capacitor

The magnitude of the resultant of two forces may be increased by

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Increasing the angle between them

Decreasing the angle between them

Drawing the parallelogram to represent them

Drawing the force perpendicularly

In case of a convex lens, when object is placed at F

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the image is formed beyond 2 F

the image is formed between F and 2 F

No image is formed

the image is formed behind the object

If in Young's double slit experiments the separation between two slits is halved then the fringe width

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Remains unchanged

Becomes double

Reduces to half

Becomes 3 times

Clouds are white because they efficiently scatter sunlight of all

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Colours

Wavelengths

Frequencies

Phases

A body of mass 2 kg is suspended in a elevator by means of a spring The balance reads its weight when the elevator moves up with an acceleration of 5 m s-2 as.

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9.8 N

29. 6 N

26.5 N

30.5 N

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

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Magnetic saturation

Low susceptibility

Retrace the path

Orientation

Which one of the following describes a measure of opposition to alternating current.

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Electrical impedance

Capacitance

Inductance

Admittance

The phenomenon of interference occurs because waves obey

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Laws of reflection

Principle of super position

Laws of motion

Inverse square law of intensities

When an electron and a positron are annihilated, then number of protons produced is.

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1

2

3

4

House hold circuits are mostly

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Wired in sires

Wired in parallel

Made using wires of gold

Made using wires of silver

A body of mass 3 kg lies on the surface of the table 2 m high it is moved on the surface 4 m the change in P.E. will be.

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9.8 J

6 J

Zero

329 J

Light wave can be polarized because they

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Are transverse in nature

Can be reflected

Have short wavelength

Have high frequncies

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

Any transparent medium bounded by one or two spherical surfaces is called

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Prism

Lens

Plane mirror

Grating

An electric Heater and a fan are marked 1000 W, 250 V and 100 W , 220 V respectively The resistance of fan is.

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Equal to that of heater

Greater than that of heater

Less than that of heater

Zero

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

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5 A

10 A

12 A

15 A

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

When a monochromatic wave enters from one medium into another the property that remains unchanged.

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Amplitude

Velocity

Frequency

Nature of the wave

X-rays are not used in RADARs because

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They are not reflected by the target

they are not completely absorbed by air

They damage the target

They are reflected by the target

Which of the following should not change in isothermal operation.

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Heat constant

Volume

Pressure

Temperature

In what form is the energy stored in an inductor.

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Magnetic

electrostatic

Magnetic and electrostatic

All of the above

The image formed on the film of a simple camera is.

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Real inverted and diminished

Virtual, upright, and diminished

Virtual, upright and magnified

Real, inverted and magnified

X-ray are

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Streams of negatively charted particles.

Electromagnetic wave

Streams of positively charged particles

Visible light

Huygen's principle is used to explain the

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Speed of light

Dispersion of light

Propagation of light

Reflection of light

The spin angular momentum and orbital angular momentum are usually differentiated in terms of.

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Radius of bodies

Mass of bodies

Torques of bodies

Momentum of bodes

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

The near point of a person is 50 cm and his far point is 200 cm The power of the lenses which his spectacles should have for reading will be

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+D

+2D

+4D

-2D

A longitudinal sinusoidal wave has a wavelength of 1 cm and a period of 2s. Its wave velocity is.

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50 cm s-1

0.00t m s-1

100 cm s-1

5 m s-1

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

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