Online Test

Question # 1

Common methods used for the conversion of biomass into fuels are

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Fermentation

In direct combustion

Direct combustion

None of these

If an aeroplane moves away the radar, the wavelength reflected from it would be

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Larger

Shorter

Remains the same

None of these

SI unit for moment arm is

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Nm^-2

Nm

Kg ms²

None of them

If an iron ball and a wooden ball of the same radius was released from a height h in vacuum,then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

The gamma camera is designed to detect

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α-radiation

β-radiation

γ-radiation

X-rays

The resistance of 20 cm long wire is 10 Ω when the length is changed to 40 cm.The new resistance is

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10 Ω

20 Ω

30 Ω

40 Ω

When a dielectric is inserted between the plates of the capacitor (Charged).The energy stored by capacitor (assume battery is disconnected)

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Increases

Decreases

Remains constant

First decreases then increases

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h.His average speed will be.

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40 km/h

48 km/h

50 km/h

60 km/h

In thermodynamics, the internal energy is a function of

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Time

State

Temperature

None of these

Light appears to travel in straight line because

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It is not absorbed by the atmosphere

It is refracted by the atmosphere

Its wavelength is very small

Its velocity is very large

The percentage uncertainty in measuring the volume of sphere measured by calipers callipers is when r = 2.25 ± 0.01 cm with least count ± 0.01 cm

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46.7 ± 0.5 cm²

47.7 ± 0.5 cm³

47.7 ± 0.6 cm³

477.6 ± 0.6 cm³

For a fixed force, larger is the mass of a body, the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

Even the small viscosity of the air causes a retarding force on car at high speed is

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Small

Large

Very large

None of these

The restoring force applied on the pendulum

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mg cos θ

mg sin θ

- mg sin θ

- mg cos θ

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

A proton is assumed to be made up of quarks

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Two up one down

Tow down one up

Two up two down

None of these

The force which maintains the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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1916

1919

1921

1923

The cars usually have cylinders on the crankshaft are

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2

3

4

6

The ratio of the numerical values of the average velocity and average speed of a body is always.

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Unity

Unity or less

Unity or more

Less than unity

In common emitter amplifier. When small signal voltage is applied at the input it changes the voltage at

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base

Emitter

Collector

None of these

In case of an ideal gas, the P.E associated with its molecules is

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maximum

zero

minimum

not fixed

In a p-type semiconductor germanium is doped with

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Gallium

Aluminium

Boron

All of above

If force acting perpendicular to electron then

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Only magnitude change

speed change

direction Change

Magnetic field change

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

Inspite of different dispersion, all the wavelengths arrive at the other end of the fibre at the same time. With a step-index fibre overall time difference may be about

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40 ns

30 ns

32 ns

33 ns

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²r

mr²/v

The common emitter amplification factor β is given by

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I_C/I_E

I_C/I_B

I_E/I_B

I_B/I_E

A ball of mass m moving with uniform speed collides elastically with another stationary ball.The incident ball will lose maximum kinetic energy when mass of the stationary ball is:

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m

2 m

4 m

Infinity

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

A stress which is along one dimension is known as:

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Tensile stress

Linear stress

Compressive stress

Both (A) and (C)

Both (A) and (B)

The fractional change in volume per unit increase in pressure is called

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Pressure coefficient

Volume coefficient

Bulk modulus

Compressibility

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

RBE of Neutrons and protons below 10 MeV is

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0.5 RBE

10.0 RBE

0.8 RBE

1.7 RBE

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1 to zero on striking the ball, then force is

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5.3 N

15 N

17.3 N

19.2 N

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

Bulk modulus is involved when the deformation is:

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One dimentional

Two dimentional

Three dimentional

Any of these

None of these

The P = VI = I²R = V²/R holds only when the

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Current lags voltage

Current leads voltage

Current and voltages are in phase

None of these

What is SI unit of mutual inductance:

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Farad

Coulomb

Henry

Ampere

A semi conductor in its extremely pure from is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

Restoring force is the

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Opposing force

Frictional force

Elastic force

All of these