Online Test

Question # 1

The relative permitivity ∈_r for transformer oil is

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2.9

3.0

2.1

2.4

When the car moves with increasing acceleration, the velocity time graph is a

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Straight line

Horizontal straight line

Curve

None of these

Magnetic lines of force:

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Cannot intersect at all

Intersect at infinity

Intersect within magnet

Intersect at neutral points

None of these

Temperature of -273°C on Kelvin scale is

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+23K

+337K

-273K

0K

The current passing a conductor is 5mA in 2s. The charge moving through it

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10²C

10⁴C

10^-4C

10^-2C

Two row boats moving parallel in the same direction and pulled toward each other due to the application of Bernoulli's equation

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Stake's theorem

Toricelli's theorem

Venturi relation

None of these

The magnetic field inside a solenoid is

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Infinite

Zero

Uniform

Non-uniform

The principle of superposition states that

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The total displacement due to several waves is the sum of the displacements due to those waves acting individually.

Two stationary waves superimpose to give two progressive waves.

A diffraction pattern consists of many interference patterns superimposed on one other.

Two progressive waves superimpose to give a stationary wave.

The unit of resistance is:

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Ampere

Volt

Ohm

Coulomb

Meter

Electric potential energy per unit charge gives the expression for

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Electric intensity

Electric flux

Electric potenial

Power

The mass of a proton is 1847 times that of an electron.An electron and a proton are projected into a uniform electric field in a direction at right angles to the direction of the field with the same initial kinetic energy.Then

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Both the trajectories will be equally curved

The proton trajectories will be less curved than the electron trajectory

The electron trajectory will be less curved than the proton trajectory

The relative curving of the trajectories will be dependent on the value of the initial kinetic energy.

Which of the following is not the unit of time

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Leap year

Lunar month

Solar day

Parallactic second

The path followed by a ballistic missile is called

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parabolic trajectory

ballisitic trajectory

both of them

none of them

Angle between ray of light and the corresponding wave front is

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10°

60°

90°

120°

The dimensions of pressure are

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[ML²T^-2]

[ML-1T-2]

[M²LT^-1]

[M²LT^-2]

To indicate the mass of atomic particles, instead of kilogram, the units is used as

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Unified mass scale

Atomic mass units

Mole

None of these

In a certain circuit, the transistor has a collector current of 10 mA and a base current of 40μA. the current gain of the transistor is

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4 x 10^-3

400

250

2500

Laser beam can be used to generate

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One dimensional images

Two dimensional images

Three dimensional images

None of these

Which has large value of relative permittivity

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Air

Glass

Plastic

Water

The nucleon is the name used for;

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Only neutron

All light nuclci

Both proton and neutron

Only hydrogen nuclci

The thermodynamics scale of temperature starts from

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273 K

zero

273.16 K

None of these

According to boyle's law, volume of a given mass of a gas is

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Inversely proportional mass at constant pressure

Directly proportional to pressure at constant temprerature

Inversely proportional pressure at constant temprature

None of these

Remanance or Retentivity is the phenomenon in which the material still remains strongly magnetized when curve is

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Increase to maximum

Reduce to minimum

Reduce to zero

None of these

A current of 1 A flows through a copper wire. How many electrons pass through any cross-section of wire in 6 sec ? Charge on an electron is 1.6 × 10^-19 C

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10¹⁹

10²⁰

10²¹

10²²

If the resistance in these successive arms of balanced bridge is 1, 2 and 36 ohm respectively, the resistance in the fourth arm will be

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72Ω

36Ω

18Ω

9Ω

In mutual induction, the mutual inductance of the two coils depends upon

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Number of turns

Area of cross section of coil

The distance between the two coils

All of them

Internal resistance and emf of a cell can be determined by an instrument

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CRO

AVO meter

Both CRO & AVO meter

Potentiometer

A thermistor measures very low temperature near

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5^oC

5k

10^oC

10 K

Which of the following statements is the Laplace's correction for the speed of sound in air

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pressure changes form P to (P +∆P)

temperature of air during compression does not remain constant

volume changes from V to (V -∆v)

none of them

At the point of contact of the lens and the glass plate, the Newton's ring is

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dark

bright

either of them

neither of them

Reduce the given number up to three significant figures 64.6546

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64.6

64.7

64.66

64.65

When the motor is just started the back emf is

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Zero

Almost zero

Maximum

None of these

Newton's third law also says that action and reaction forces always act on the

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Different bodies

Same bodies

Only one body

None of these

A body will be in rotational equilibrium if

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The oscillations in which the amplitude decreases steadily with time are called

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Undamped

Damped

Sometimes undamped

None of these

The phenomenon of diffraction also contains the phenomenon of

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Polarization

Interference

Dispersion

None of these

The process where by energy is dissipated from the oscillating system is called

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Resonance

Oscillation

Damping

None

The diameter of an atom is

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10^-7 m

10^-10 m

10^-12 m

10^-14 m

The efficiency of carnot's engine can never be 1 or 100% unless cold reservoir is

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100 K

1 K^o

0 K^o

None of these

Digital circuits can be made by repetitive use of

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AND gate

OR gate

Not gate

NAND gate

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 than

Smaller than

Equal to

none of these