Question # 1

The wave form of S.H.M will be

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square wave

sine wave

rectified wave

saw-tooth wave

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

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

If a mass of 10 gm is suspended from a spring of k = 9.8 Nm^-1, then the extension will be:

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1 cm

1 m

10 mm

None of these

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

Acceleration of a body is negative if the velocity of the body is

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constant

increasing

decreasing

none of them

Max Planck received the Nobel Prize for his discovery of energy quants in:

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1718 AD

1918 AH

1818 AD

1918 AD

None of these

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

According to the first condition of equilibrium, vector sum of all the forces action on the body must be

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maximum

minimum

zero

none of them

Glare produces when light reflects from water snow and rough road surfaces when their angle of incidence is

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Small

Large

Very large

None of these

The half-life of a radioactive element which has only 1//32 of its original mass left after a lapse of 60 days is:

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12days

10days

22days

36days

When the car moves with increasing acceleration, the velocity time graph is a

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Straight line

Horizontal straight line

Curve

None of these

In full wave rectification by bridge the number of diodes required are

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3

4

2

5

The components of a fibre optic communication system is/are

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At transmitter

An optical fibre

Receiver

All of these

The escape velocity of Earth in Kms^-1

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9.75

11.2

12.3

15.6

In slow Compression of a gas in a cylinder is reversible as the compression can be changed to expansion by

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Rapid decreasing the pressure

Slowly decreasing the pressure

Extremely decreasing the pressure

None of these

The SI unit of momentum is

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Kgms^-1

Kgms^-2

N.S

a and c

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

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Equal to

Greater than

Smaller than

None of these

A particle of mass 'm' at rest is acted upon by a force 'P' for a time 't' its kinetic energy after an interval 't' is

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P²t²/m

P²t²/2m

P²t²/3m

Pt/2m

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