Question # 1

The strength of magnetic field around the current conductor is

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Smaller near the conductor

Greater near the conductor

Greater at the large distance from the conductor

Constant near and away from the conductor

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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transformer

rectifier

filter

none of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

The linear momentum of the body is defined as

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p=ma

p=1/2ma

p=mv

p=1/2mv

The magnitude of the force producing an acceleration of 10 m/sec²in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

The sum of positive and negative peak values is called:

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Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

The time interval during which the Voltage source changes its polarity once is known as:

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Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

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9.4 kHz

940 kHz

94 kHz

None of these

A massive object falls through a fluid:

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Faster

Slower

Slowest

None

To and from motion of a body about its mean position is known as:

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Translatory motion

Vibratory motion

Rotatory motion

None of these

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

In a normal healthy person the value of systolic pressure is

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75 torr

80 torr

120 torr

all of them

When a vector is multiplied by a negative number, its direction:

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Remains the same

Changes

Changes by 180°

None of these

Significant figures in 0.0010 are

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Four

Three

Two

One

The reactance of a cell changes directly with

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frequency of a.c

the inductance

both a and b

none of these

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

Resonance occurs when one of the natural frequencies of vibration of the forced or driven harmonic oscillator

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greater than the frequency of applied force

equal to the frequency of applied force

less than the frequency of applied force

all of them

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

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5N

4N

1.5N

6N

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

At the present time, the main frontiers of fundamental science are

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2

3

4

5

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

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