Question # 1

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is

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Same

2 times

4 times

8 times

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

Their time of flight will be same

Under normal circumstances, the volume of blood is sufficient to keep the vessels

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flatted for all times

inflated for all times

inflated for small times

none of them

The strength of magnetic field at certain points around a wire depends upon:

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Value of current passing

Distance from the current element

Color of the material

Both (A) and (B)

Both (B) and (C)

A two Kg block is held 1 m above the floor for 50 seconds, the work done is:

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Zero

10.2 J

100 J

980 J

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

The current produced by moving a loop of wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

The sum of positive and negative peak values are usually written as

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P-P value

negative

zero

may be positive or negative

The waves which propagate out in the space due to oscillations of electric and magnetic fields are called:

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Mechanical waves

Electromagnetic waves

Matter waves

All of them

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

In old age, arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from

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Pascal's law

Stoke's law

Bernoulli's principle

Archimedes principle

An elevator weighing 3.5 × 10⁶ N raised to a height of 100 m in the absence of friction the work done is

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3.5 × 10³ J

3.5 × 10⁴ J

3.5 × 10⁶ J

3.5 × 10⁹ J

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

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9.8 m

14.7 m

4.9 m

19.6 m

A source of a magnetic field is:

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An isolated magnetic

A static electric charge

A moving electric charge

None of these

A particle is moving with a constant speed along a straight line path A force is not required to

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Increase its speed

Decrease its momentum

Change its direction

Keep it moving with the same speed

In a couple, the resultant of two forces is

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2F

F

F / 2

Zero

Huygen's wave front which sends out secondary wavelets with a speed equal to

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Speed of propagation of the wave

Speed of propagation greater than wave

Speed of propagation less than the wave

None of these

An image formed by a concave lens is always

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Virtual

Real

Inverted

None of these

Pure form of semiconductor is called

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Extrinsic semiconductor

Intrinsic semiconductor

N type

P type material

The junction potential for Germanium is;

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3v

0.3 v

7v

0.7 v

When light signal travels along fibres, the power losses are mainly due to

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scattering

absorption

both of them

either of them

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