Online Test

Question # 1

One gray is equal to

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1 N kg^-1

1 dyne kg^-1

1 J kg^-1

None of these

For average velocity of a body, it has

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Straight path

Curved path

Steady motion or variable

All of them

The numerical values of the ratio of displacement to the distance is

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Always less than one

Always equal to one

Always more than one

Equal to or less than one

The rate of change of angular momentum is

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The applied force

The moment of inertia

The applied torque

Impulse

The flow of conventional currents and is equal to

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I_C= I_B+ I_E

I_E= I_C+ I_B

I_B= I_E+ I_C

None of these

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

The process for which entropy remains constant is a process

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Reversible

Irreversible

Both

None of these

Hydrogen bomb is an example of

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nuclear fission

nuclear fusion

chain reaction

chemical reaction

Newtons third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

According to WH Bragg and WL Bragg monochromatic beam of X-rays was reflected form a crystal plane is like a

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Smooth and regular

Mirror

Thin film

None of these

A compound microscope is consists of

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One convex lens

Two convex lenses

Two concave lenses

None of these

If two conducting spheres of radii r₁ and r₂ are charged such that they have the same electric field on their surface, The ratio of the electric potential at their centers will be:

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√r₁/r₂

r₁/r₂

r²₁/5r₂

All of these

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength of sound

Amplitude and frequency of sound

If the volume of the gas is to be increased by 4 times then

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Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

Bulk modulus for water is

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2.2

4.5

6.2

7.3

The chemical absorbed mostly by the thyroid gland is

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Iodine

Radio iodine

Sodium

Iron

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3 x 10⁵J

2 x 10⁵J

10⁵J

Zero

Identify the vector quantity

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Heat

Angular momentum

Time

Work

Consult page 50 of your text and trick the correct statement.

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Velocity of x-rays is greater than velocity of light

Velocity of right light is less than velocity of radio waves

Velocity of light, x-rays and radio waves is the same

None of the above is correct

Waves in ocean are produced due to

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Tidal movement

Winds

Both A and B

Sunlight

Most OP-AMP operates with

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+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

When a body moves in a circular path,no work is done by the force since.

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Force and displacement are perpendicular to each other

The force is always aways from the centre

There is no displacement

There is no net force

The light source in the transmitter can be either

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Light emitting diode

Semiconductor laser

Light emitting in an invisible infra red

All of these

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 eV

10⁶e V

10³e V

1.0 e V

The frequency of a string on musical instrument can be changed by

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varying the tension

changing the length

either of them

neither of them

The cars usually have cylinders on the crankshaft are

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2

3

4

6

On increasing the reverse bias to a large value in a p-n junction diode current

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Increases slowly

Remains fixed

Suddenly increases

Decreases slowly

The diffraction is found to be prominent when the wavelength of light is

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small as compared with the size of obstacle

large as compared with the size of obstacle

equal as compared with the size of obstacle

Very small as compared with the size of the obstacle

What temperature of a conductor increase the resistance:

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Increases

Remains same

First increases then increases

None of the above

The minimum frequency below which no electrons are emitted is called

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Lowest frequency

Threshold frequency

Synchronized frequency

None of these

The defection in moving coil galvanometer falls from 50 division to 10 division,when a shunt of 12 Ω is applied the resistance of galvanometer coil is

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24 Ω

12 Ω

50 Ω

48 Ω

The unit of resistance is

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volt

ampere

ohm

farad

A diffraction grating of length 2cm has 4000 lines The grating element is

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0.5 x 10^-2 cm

5 x 10⁴

5 x 10^-4

0.5 x 10^-4 cm

The dimensional formula for angular momentum is:

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(M°L²T^-2)

(ML²T^-1)

(MLT^-1)

(ML²T^-2)

A uniform beam of weight 100 N is 4 m long and is supported 1.0 m from one end. A load of weight wN hangs from that ened and the beam is in equilibrium.What is the value of w?

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50 N

75 N

100 N

200 N

The average velocity of Jupiter in Kms^-1

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25

50

58.4

61.0

Average binding energy per nucleon for a heavy nucleus is

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8 x 10^-3 eV

0.5 eV

7.6 MeV

13.5 eV

This effect was observed by Johan Doppler while he was observing the frequency of light emitted from

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Sun

Moon

Distant stars

None of these

The time period of a system executing simple harmonic motion depends upon

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Amplitude

Force constant

Mass

b and c

αand β-particles both radiate energy like X-ray photon when they are subjected in an

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Electric field

Magnetic field

In both electric and magnetic field

None of these

If length of seconds pendulum on the surface of earth is 1 m them length of second pendulum on surface of moon is

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1/6 m

6 m

1/36m

36m