Online Test

Question # 1

When a proton enters into a magnetic field perpendicularly, the proton will experience a force along the

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upward direction

downward direction

undeflected

None of these

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young;s modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized.

The equation_ZX^A → _Z+1 Y^A+_-1e⁰ +V is

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β-emission

α-emission

e-capture

fission

Internal resistance is the resistance offered by

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Source of emf

The conductor

The resistor

The circuit

X rays are affected by

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Electric field only

Electric and magnetic field

Magnetic field only

None of these

The charge moving parallel to the magnetic field 'B' with a certain velocity 'v' experiences

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No Force

Maximum Force

Minimum Force

None of these

The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 10⁹Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 10⁵kg.

(g = 10 N kg^-1)

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10^-2m²

10^-1m²

10^-4m²

10^-3m²

Due to collisions of electrons, with the atoms of conductor, the energy transfer ultimately to the

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Atoms

Electrons

Lattice

All of them

Gamma-rays are electromagnetic radiations similar to

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Radio waves

Photons

X-rays

Beta rays

Conditions for interference are that the two sources should be coherent and:

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At the far off distance

Close together

Coinciding

None of these

Body A is said to be in the thermal equilibrium with body B when

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It obeys the first law of thermodynamics

It obeys the second law of thermodynamics

It obeys the Zeroth law of thermodynamics

all of them

A spring balance is graduated at sea level. If the body is weighted with this balance at consecutively increasing heights form the earth's surface the weight indicated by the balance will

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Go on increasing continuously

Go on decreasing continuously

Remain the same

First increase and then decrease

The instantaneous velocity is define as the limiting value ofΔd/Δtwhen the time intervalΔt approaches to

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zero

maximum

minimum

infinity

Upon applying some unbalanced external stress the deformation may be observed in

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Length

Surface area

Volume

All of these

If the water exists from the pipe at the rate 1.5 kgs^-1 at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

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5.53 N

5.03 N

1.35 N

0.45 N

A 200 volt, 1000 W bulb is connected across a 1100 volt main supply.The power consumed will be

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1000 W

750 W

500 W

250 W

The ultimate tensile strength (UTS) can be regarded as the

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

The process of liquefaction and evaporation of a substance performed slowly are

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Reversible

Practically reversible

Not reversible

None of these

A galvanometer is an electrical instrument which can

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Measure current

Measure voltage

Phase

All of them

The volt/metre is the unit of:

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Potential

Work

Force

Electric field intensity

If a light of λ = 588 nm falls on half silvered glass plate in Michelson s interferometer if movable mirror is moved through 0.233 mm the number of fringes will be observed to shift

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795

792

786

None

Two charges are separated by 0.5 m. Now the 0.25 m distance between the two charges is reduced to half of the first distance, how would the electric force become

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4 times

8 times

12 times

16 times

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

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Pressure coefficient

Volume coefficient

Bulk modulus

Compressibility

P-type semi conductor is electrically

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Positive charged

Negatively charged

Neutral

No one

The heat generated during the passage of electric current is given by

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H = IR²t

H = IRt²

H = I²Rt

H = I²Rt²

Sub atomic particles that do not experience strong nuclear force are called

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Leptons

Hadrons

Measons

Quarks

Minimum number of unequal forces whose vector sum can be zero is

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3

4

2

5

Thermocouples convert heat energy into

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Mechanical energy

Chemical energy

Electrical energy

None of these

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Neither AC nor DC

Newton's third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

If P is the pressure and V is the volume, Then PV will represent:

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Power

Work

Force

None of these

Using the relativistic result, the location of an aircraft after an hour's flight can be predicted to about

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20 m

30 m

50 m

57 m

The angular speed of a flywheel making 120 revolutions/minute is:

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π rad/s

2π rad/s

4π rad/s

6π rad/s

A simple harmonic motion in which the

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Acceleration is directly proportional to displacement

Acceleration is directed towards the mean position

Acceleration produced is due to restoring force

All of these

The change in resistivity per unit original resistivity (or resistance) per degree change in temperature is called

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Resistance

Conductance

Temperature coefficient of resistivity

All of these

Copper sulphate is dissociated into Cu⁺⁺and So₄^--ions when it is:

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In solution form

In solid form

In gaseous form

Both (A) and (C)

None of these

Computerized axial tomography (CAT-scanner) is a system in which X-rays are

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Maximum through the subject

Minimum absorptions through the subject

Depending upon the subject

None of these

If focal length of objective is increased

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Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

A wire of resistance 3.0 W is stretched to twice its original length. The resistance of the new wire will be

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1.5 Ω

3.0 Ω

6.0 Ω

12 Ω

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

To decrease timing uncertainly

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Increase number of vibration

Decrease number of vibration

Increase length of pendulum

Decrease length of pendulum