Question # 1

According to the law of conservation of linear momentum, the total linear momentum of an isolated system

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increases

decreases with time

remains constant

none of them

Total number of base units are

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Three

Five

Seven

Nine

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

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

When a bicycle is in motion, the frictional forces exerted by the ground are

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In the forward direction on both the wheels

In the backward direction on both the wheels

In the forward direction on the front wheel and the backward direction on the rear wheel

In the backward direction on the front wheel and the forward direction on the rear wheel

The practical application of the phenomenon of Mutual induction is

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Transformers

Generator

Motor

All of these

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

None of these

In case of metallic conductors, the change carries are:

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Protons

Electrons

Antiprotons

Positrons

Both (A) and (B)

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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decreases

first increases then decreases

increases

any one of them

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

When a horse pulls a cart the force that helps the horse to move forward is the force exerted by

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The cart on the horse

The ground on the horse

The ground on the cart

The horse on the ground

Insulators are those materials in which valence band is

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Empty

Partially filled

Full

None of these

The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

A circular scale is attached and graduated in

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One degree

2 degrees

Half degree

None of these

Electric current is defined as:

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Flow of charges through conductor

Rate of flow of charges through conductor

Flow of electrons

Flow of protons

An object is placed between the focus and the optical center of the convex lens. The image formed is

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Real, erect and magnified

Virtual, inverted and magnified

Virtual, erect and diminished

Virtual, erect and magnified

Shear modulus for aluminium is

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30

70

80

90

For constructive interference the path difference is

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mλ

(m-1)λ

m²λ

1/2mλ

A man is an elevator descending with acceleration will conclude his weight has

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Increase

Decrease

Remain constant

Become zero

A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be:

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Zero

Infinite

One

100

Hooks law hols within

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Proportional limit

Elastic limit

Plastic limit

None

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