Question # 1

____________ deals with temperature .

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Bio physics

Geophysics

Thermo physics

Plasma physics

If W stands for work, F stands for force and S stand for displacement, than mathematical work is defined as

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W = P x S

W = F x v

W = F x r

W = F x S

Convection of heat is the process of heat transfer due to the:

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Random motion of molecules

Downward movement of molecules

Upward movement of molecules

Free movement of molecules

................ causes coastal breeze.

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Conduction

Convection

Radiation

Nil

The value of gravitational constant is, G is:

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6.67× 10-10 Nm2/Kg2

6.67× 10-11 Nm2/Kg2

6.67× 10-11

None

The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth is

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850 km

1000 km

6400 km

42,300 km

Standards, of physical quantities were established in .

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1910

1020

1950

1960

Momentum is quantity

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Scalar

Vector

Base

All

The potential energy of a body of mass 'm' placed at a height 'h' above the surface of earth is equal to

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P.E. = mg

P.E. = mgh

P.E. = 3mgh

P.E. = 2mgh

The eleventh general conference was held in Paris in.

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1959

1961

1660

1960

Moon is our satellite:

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Artificial

Permanent

Natural

Communication

Mathematical formula of capacitance of a capacitor is:

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C = QV

C = Q/V

C = V/Q

C = V2/Q

The device which converts digital quantities into analog quantities is called:

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ADC

DAC

ACD

CAD

an ideal voltmeter is that which draws:

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small current

no current

high current

none of these

Electric intensity is a quantity.

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Scalar

Vector

Base

None of these

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

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Dioptre

Volt

Ampere

Watt

A device which has two ways of communication is:

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television

radio

hard disk

mobile phone

The electrostatic force acting on two charges each of 1 C separated by 1m is about .

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9 x 10⁹ N

9 x 10^-9N

9 x 10⁸N

9 x 10^-8N

Which memory consists of integrated circuits?

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Primary memory

Audio cassette

Video cassette

Compact cassette

In series combination of capacitors, each capacitor will have same:

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Voltage

Charge

Capacitance

Charge and voltage

An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror:

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-4.1 cm

-8.2 cm

-9.9 cm

-20 cm

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

The speed \velocity of sound is greatest in.

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Air

Steel

Ammonia

Water

Increase in the velocity of sound in air for 1 ^oC rise in temperature is.

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61 ms-1

0.61 ms-1

161 ms-1

261 ms-1

10 N and 20 N are acting on a body of mass 2 kg the minimum acceleration will be.

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10 ms-2

20 ms-2

60 ms-2

5 ms-2

Bending of light around the edges of an obstacle is called.

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Refraction

Polarization

Interference

Diffraction

Apparent weight of a man is in upward accelerated lift will

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Increases

Decreases

Remain same

Increases then decrees

A man of mass 5 kg is falling freely, the fore acting on it will be

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5 N

9.8 N

19.6 N

49 N

Opted unit to measure blood pressure is.

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N/m2

Pascal

mm of Hg

N.m2

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

The accepted value for speed of light in vacuum

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2.99 x 10⁸m - sec^-1

2.99 x 10⁶m - sec^-1

2.99 x 10⁸km - sec^-1

2.99 x 10⁸m - h^-1

If 'N' is number of lines rule don the grating having length 'L' then grating element 'd' is given by.

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N/L

2N/L

L/N

N/2L

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

Which one of the following resistance is used to convert a Galvanometer into an ammeter.

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High resistance

Low resistance in series with galvanometer

Shunt

High resistance in series with galvanometer

Rutherford performed on experiment on a nuclear reaction in:

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1921

1981

1927

1932

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

Paschen series lies in the

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Far ultraviolet region

Visible region

Ultraviolet region

Inferred region