Question # 1

The rear wheels of an automobile are rev/sec which is reduced to 38 rad/sec in 5 seconds when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rav/sec²

-10 rad/sec²

-5 rav/sec²

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

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1.7 x 10³J

10.2 x 10³J

3..4 x 10³J

6.8 x 10³J

Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.

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Disc, sphere

sphere, hoop

Thin rod, hoop

Hoop,disc

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

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45 V

15 V

90 V

300 V

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

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one ohm

one joule

one volt

one ampere

The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The concept of direction and position are purely

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absolute

relative

absolute or relative

none of these

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

The modulus of rigidity of a liquid is

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Zero

1

Infinite

None of these

The deflection by Einstein is as great as newtons is

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Twice

Thrice

Four times

Half time

The magnetic field produced due to the current in a straight wire is proportionalto the :

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Electric current

Conducting material

Length of the wire

Diameter of the wire

Which of the following statement about centripetal and centrifugal force is correct

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They are oppositely directed

They cancel each other

Both are on the same body

None of these

Two wires of the same material have diameters in the ration 2 : 1 if they are stretched by the same force their elongations will be in the ratio

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8 : 1

1 : 8

2 : 1

1 : 4

Negative and positive charge in a hollow sphere are equal in the number then flux from the surface will be

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Zero

Positive

Negative

Flux will be both negative and positive

Energy per unit volume of a stretched wire is

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(1/2) x load x extension

Load x stress

Stress x strain

(1/2) x stress x strain

Which of them is not a physical quantity

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Density

Impulse

Energy

Kilogram

In case of linear deformation, the ratio of the tensile stress to the tensile strain is called

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Young's modulus

Bulk modulus

shear modulus

all of them

The maximum stress that a material can withstand is known as

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plastic point

elastic point

yield point

ultimate tensile strength

The relative permitivity for vacuum is

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1

2

1.002

1.004

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