Question # 1

Breaking system in vehicles depends upon:

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Pascal's law

Hook's law

Archimedes law

Principle of floatation

Centre of gravity of uniform square is:

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Intersection of diagonals

Point of intersection of medians

At centre

None of these

The approximate weight of 80 gram mass on the surface of Earth is

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800 N

80 N

0.8 N

8 N

The changing of a liquid into vapours from the surface of the liquid without heating:

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Cooling

Vaporization

Evaporation

Sublimation

Torque is a ___________ quantity.

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Vector

Scalar

Base

All of these

The unit of torque is:

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N

Nm

m

m/n

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

The force exerted perpendicularly on unit of area of an object is called:& nbsp

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strain

young's modulus

pressure

buoyant force

In Which of the following state molecules do not leave their position?

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Solid

Liquid

Gas

Plasma

A line about which a body rotates is called;

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Axis of rotation

Rigid Body

Center of gracity

None of these

Co-efficient of friction between glass and glass.

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1.0

0.9

1

0.8

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

Electric potential is a quantity:

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Scalar

Vector

Base

All

Positive charge can be produced by:

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Combing in hair

Rubbing glass rod on silk

By rubbing ebonite rod on wool

By rubbing glass rod wool

LDR can act as:

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Diode

Switch

Transistor

Rectifier

The amount of current that causes the loss of muscle control is:

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0.1A

0.015A

2A

1A

The equivalent resistance in parallel combination is:

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R_c=R₁+R₂+R₃ +.................+R_n

R_c=1/R₁+1/R₂+1/R₃+.................+1/R_n

a and b

None of these

Specific resistance of silver is:

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1.7x10^-8 Ω.m

2.63x10^-8 Ω.m

2.75x10^-8 Ω.m

7.0x10^-8 Ω.m

Power of lens is:

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q/p

1/q

1/p

1/f

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

The energy is transferred from one place of another:

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through matter

through waves

both a and b

through vacuum

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

At constant temperature and pressure, if volume of given mass of a gas is doubled then density is.

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Doubled

1/4 original

1/2 of original

Unchanged

The error in speed of sound calculated by Newton at STP is about.

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0 %

14 %

15 %

16 %

Motion of projective is

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One dimensional

Two dimensional

Three dimensional

Four dimensional

If an object lies at focus point F in front of a converd lens, its image is formed at.

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2F

F

3F

Infinity

The wavelength of fundamental note in one end closed pipe in term of length 'l' of pipe is.

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4 l

2l

l

1/4 l

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The dimensions of work are.

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[MLT-1]

[MLT-2]

[ML2T-2]

[MLT]

If heat is added to a system, then its entropy will.

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Increases and positive

Decrease and positive

Increases but negative

Decreases but negative

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

Which is nooptically active

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Sugar

Tartaric acid

Water

Sodium chloride

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

Earth orbital speed is.

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10 km/s

20 km/s

30 km/s

40 km/s

1 gray is equal to.

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1 JKg-1

1KgJ-1

1JKg

1 JKg-2

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years