Question # 1

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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3

24

126

200

Method "lamp and scale arrangement" used to measure the

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angle of deflection

restoring torque

magnetic field strength

current

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

In 1932 Chadwick discovered

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proton

neutron

photon

electron

When a position comes close to an electron they annihilate into photons such that

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each photon has energy 0.51 Me v

each photon has energy 1.02 Me v

each photon has energy 0.25 Me v

none of these

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

The value for systolic blood pressure for a normal healthy person is

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140 torr

80 torr

90 torr

120 torr

An ideal voltmeter has:

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Zero resistance

Small resistance

Large resistance

Infinite resistance

Both A and B

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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decreases

first increases then decreases

increases

any one of them

Tick the one which is not polymer solid:

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Zirconia

Polythene

Nylon

Synthetic rubber

None of these

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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classical mechanics

Newtonian mechanics

quantum mechanics

statistical mechanics

The time taken by the light to travel from Sun to Earth is

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4 min 20 sec

5 min 20 sec

8 min 20 sec

9 min 20 sec

In a uniform circular motion (horizontal) of a ball tied with a string,velocity at any time is at any angle θ is

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θ = 60°

θ = 30°

θ = 90°

None of the above

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

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115 m

1.15 m

11.5 m

0.115 m

Material with smaller hystersis loop area are best for the construction of

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Transformer

Core of transformer

D.C motor

Rectifier

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

In an astronomical telescope the eye piece has the focal length f_e if

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Short

Long

Extremely long

None of these

Laws of motion are valid in a frame which is

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Uniform motion

Inertial

Both a and b

None of these

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

The period of a satellite when there is critical velocity is

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80 min approx

84 min approx

82 min approx

90 mix approx

In launch mass of the rocket fuel is

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70%

80%

more than 80%

90%

Layer of oil on water in sunlight appears coloured due to

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diffraction of light

dispersion

interference of light

polarization of light

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