Online Test

Question # 1

Power delivered to 'R' is given by

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P_{out = IR}

P_out= I/R

P_out= I²R

P_out= R/I

The waves in which the particles of the medium have displacement along the direction of propagation of waves are called

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longitudinal waves

transverse waves

non-mechanical waves

none of them

The total internal reflection takes place for glass-air boundary is then the angle is

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Equal to 41.8^o

Greater than 41.8^o

Less than 41.8^o

None of these

What is the maximum possible efficiency of a steam engine that uses steam at a temperature of 100°C on a day when the temperature is 300K? (round off the answer to the nearest whole number?

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19%

20%

80%

81%

The 'β' is the coefficient of the gas for

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Linear expansion

Volume expansion

Area expansion

None of these

If a stretched string of length 'I' is plucked from its centre, two waves originate, such that

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both will move towards left

both will move towards right

one towards left and other towards right

any one of them

A system may be in equilibrium when

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the resultant force acting on it is zero

the resultant torque on it is zero

the sum of clockwise and anticlockwise moments (taken about the same point) are equal

all of them

The rate at a which the angular displacement is changing with time is called

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Angular acceleration

Angular velocity

Average angular velocity

None of these

In the theory of dimensional analysis, heat may be properly represented by:

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ML²T^-2

MT^-2

ML^-1T^-1

None of these

In a pivoted galvanometer, the coil of the galvanometer is pivoted in between

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Bearings

Jewels

Bolts

None of these

Single mode step index fibre is used to send

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white light

green light

a strong monochromatic light

yellow light

α-particles is absorbed by

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1 mm sheet of copper

A paper

Lead sheet of 1 cm

None of these

The stationary waves have a discrete set of frequencies f₁, 2f,3f₁.........nf₁known as

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fundamental frequencies

basic frequencies

independent frequencies

harmonic series

Newton's rings are:

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Rectangular

spherical

Concetric circles

None of these

When a sillicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

The alarm requires a voltage for its activation is

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Low

High

Very High

None of these

Selenium is an

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Insulator

Conductor

Semiconductor

Photo conductor

In an A.C. circuit the current lags behind the voltage by π/3.The components in the circuit are

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R and L

L and C

R and C

Only R

Which of the following isotope is used to study the blood circulation?

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Na-23

1-131

Na-24

Both A & B

Stoke's law holds for bodies of the shape

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Spherical

Rectangular

Oblog

All of these

Two boats moving parallel in a river

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Are pulled towards each other due to less pressure in between them

Get part due to increases in pressure in between them

Remain always parallel as there is no change in pressure

None of these

A pair of forces equal in magnitude and opposite in direction with non-coincident lines of action is known as

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A couple

A moment of force

A null vector

All of these

The resistance of a voltmeter should have a very high resistance

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It does not disturb the circuit

It draws some current

It same the galvanometer coil

None of these

Base quantities are those which

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Remain the same

Can be derived

Further divided

None of these

If voltage of 3.5 is applied to gate it will accept it as

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Low

High

Maximum high

None of these

A non-uniform beam of weight 50 N is 2 m long and is supported on a pivot situated in the exact middle of the beam. The centre of gravity of the beam is 0.5 m ot the right of the point where the pivot touches the beam. What weight has to be added to the left side of the beam so that the beam stays perfectly balanced (in equilibrium)?

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25 N

12.5 N

50 N

Not enough information to answer the question

Which one is not fundamental (Basic) operation of Boolean?

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OR

NOT

XOR

AND

Which of the following has no dimension

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Stress

Strain

Elastic modulus

Both strain and elastic modulus

Which of the circuit element permit the flow of alternating current but not the direct current

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Resister

Capacitor

Inductor

Both inductor and capacitor

The general theory of relativity treats problems involving

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inertial frame of reference

accelerating frame of reference

both of them

none of them

According to Huygen's principle, every point of a wavefront may be considered as a source of

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primary wavelets

secondary wavelets

either of them

both of them

If the light travels in a straight line, the central region should appear

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Bright

Dark

No effect

None of these

The magnetic fields produced by electron in an atom is due to

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Spin motion

Orbital motion

Both a & b

All above

In case of destructive interference of two waves, the amplitude of the resultant wave will be ______ either of the waves

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Greater then

Smaller then

Equal to

None of these

In a thermocouple minimum current flows at:

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Maximum temperature

Temperature of inversion

Minimum temperature

Twice the temperature of inversion

The angle between rectangular components of a vector is

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0°

60°

90°

120°

Thermistors with high negative temperature coefficient are very accurate for measuring low temperature near

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100 K

10 K

5 K

0 K

If the instantaneous velocity of a body does not change, the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

Which of the following is not emitted by a radioactive substance

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Electrons

Electromagnetic radiations

Helium nuclei with a charge equal to that of two protons

Neutrons

A body falling freely under the action of gravity has

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Constant weight

Variable weigth

Maximum weigth

No weigth

Trajectory of projectile is

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Ellipse

Hyperbola

Parabola

None of these