Question # 1

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

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Instantaneous value

RMS value

Value averaged over a cycle

Either (B) or (C)

Either (A) or (C)

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

When quarter of a circle is completed, the phase of vibration is:

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90°

180°

45°

360°

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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second law thermodynamics

first law of thermodynamics

third law of thermodynamics

none of them

The special theory of relativity is based on the

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one postulate

two postulates

three postulates

four postulates

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

A relationship between Gauses of magnetic induction and Tesla(T) is given by

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G 10^-3T

G = 10^-2T

G = 10^-4T

G = 10^-1T

For measuring the angle between two vectors graphically, we join:

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Tails of both the vectors

Tail of one vector with the head of other

Heads of both the vectors

None of these

A massive object falls through a fluid:

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Faster

Slower

Slowest

None

INTELSAT operates at frequencies 4, 6, 11, 14 having unit of:

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KHz

MHz

GHz

BHz

Torque of a force is a vector quantity, its direction is determined by

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Right hand rule

Knowing the direction of F

Knowing the position of origin

none of these

For a given angle of projection if the time of flight of a projectile is doubled the horizontal range will increases to:

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Four times

Thrice

Once

Twice

Fiber optics also used to transmit light

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Around corners

Into inaccessible place

Formerly unobservable objects

All of these

Find the range of the projectile, having speed 30 ms^-1in a direction 30° above the horizon

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50 m

80 m

90 m

100 m

The expression of energy stored in an inductor of length L and current I can be expressed by a relation

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1/2 LI²

1/2 I²L

1/2 I²L²

1/2 IL

If the vector sum of all the external forces acting on a body is zero, then the body will be in

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rotational equilibrium

translational

complete equilibrium

all of them

For single slit diffraction the first minimum occurs when

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dsinθ = λ

dsinθ = λ/2

dsinθ = 2λ

dsinθ = mλ

The atoms or molecules in a crystalline solid are held together by

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Attractive force

Gravitational force

Cohesive force

Electromagnetic force

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Initial velocity

Variable velocity

Instantaneous velocity

None of these

Iron, cobalt and nickle are examples of

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

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

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