Question # 1

Mass of earth is approximately _________

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3.7 x 10²⁴ kg

25.94 kg

6.0 x 10²²kg

6 x 10²⁴kg

The transfer of heat by vibrating molecules in solids :

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Conduciton

Radiation

Convection

None

Ability of body to do work due to its height is called.

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potential energy

kinetic energy

gravitational potential energy

elastic potential energy

Thermal conductivity of iron is Wm^-1 K^-1

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85

36

89

86

Formula of Power:

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P = wt

P = w/t

P = t/w

P = w/t²

The devise used to measure the atmosphere pressure is:

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Rain gauge

Vacuum cleaner

Screw gauge

Barometer

The study of the structure and properties of atom is called.

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Electricity

Nuclear physics

Geo Physics

Atomic Physics

A body jumps out of a moving bus. There is a danger for him to fall:

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Towards the moving bus

Away form the bus

In the direction of motion

opposite to the direction of motion

The radiation from sun is:

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Alpha

Gamma

Radio

Ultraviolet

The formula of heat capacity is:

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mc

mc𝜟𝜽

mc𝜟Q/𝜟T

None of these

Due to _____________ we can watch live programs.

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Natural Satellite

Antenna

Artificial satellite

Nil

The force applied on the mass attached with a spring is represented by:

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f_a

f_c

f_ext

f_s

Which of the following characteristic of a wave is independent of the others .

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speed

frequency

amplitude

wavelength

The S.I unit of power of a lens is:

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Dioptre

Volt

Ampere

Watt

The speed of sound in the air at one atmospheric pressure at room temperature is:

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343 ms-1

346 ms-1

349 ms-1

339 ms-1

Mice can hear frequencies upto:

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100, 000 Hz

25.000 Hz

120,000 Hz

1,000 Hz

The substances which do not have free electrons are called:

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Insulators

Conductors

Semiconductors

None of these

Which among the following radiation has more penetrating power?

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A beta pareticle

A gamma particle

An alpha particle

None of these

Which is not a hardware device?

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CPU

Windows

Keyboard

Mouse

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

An object gains excess negative charge after being rubbed against another object, which is:

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Neutral

Negatively charged

Positively charged

Either, a, b or c

The pitch of a sound is most closely related to its:

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Wave form

Period

Amplitude

Frequency

Curie temperature is a point where :

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Diamagnetism changes to paramagnetism

Paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

Paramagnetism changes to Ferromagnetism

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

The effective value of any sinusoidal alternating current or voltage is

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None of the above

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

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