Question # 1

Neon gas have three isotopes whose atomic numbers are

Choose an answer

20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

The concept of direction is purely:

Choose an answer

Absolute

Relative

Relative to stars always

Relative to the sun always

None of these

The current in LCR circuit will be maximum whenωis

Choose an answer

As large as possible

Equal to natural frequency of LCR system

Work done is maximum when angle between force and displacement is:

Choose an answer

0°

90°

180°

None of these

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

Choose an answer

Zero

Max

Min

-ve

Glass and high carbon steel are the examples of

Choose an answer

brittle substances

ductile substances

plastic substances

elastic substances

The earth's potential is taken as

Choose an answer

Negative

Positive

Zero

Infinite

The critical temperature of tin is

Choose an answer

1.18 K

4.2 K

3.72 K

7.2 K

If a given spring of spring constant K is cut into two identical segments, the spring constant of each segment is:

Choose an answer

K/2

2 K

4 K

None of these

Blood has a density

Choose an answer

Equal to water

Greater then water

Lesser then water

None of these

In the resonance condition, the amplitude of the oscillator becomes

Choose an answer

very large

very small

zero

any one of them

The counter, which also provides the power to the G.M. tube is called:

Choose an answer

Thin mica window

thin glass window

Airy window

Wooden window

None of these

The special theory of relativity is based on:

Choose an answer

Four postulates

Three postulates

Two postulates

One postulate

None of these

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Choose an answer

maximum frequency

minimum frequency

threshold frequency

all of these

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

Choose an answer

remains the same

decreases

increases

none of them

G.P. Thomson observer experimentally that electrons and neutrons possess

Choose an answer

particle-like properties

wave-like properties

neither particle nor wave like properties

none of these

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Choose an answer

6 ohm

4 ohm

zero ohm

1.33 ohm

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

Choose an answer

49 rad/sec²

1 rad/sec²

0.16 rev/sec²

Both A and C

Both B and C

The nuclei of an element having the same charge number but different mass numbers are called:

Choose an answer

Isobars

Isotopes

Isomers

Isobaric

Isothermal

The force acting on a charge moving in a magnetic field

Choose an answer

is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

In a voltmeter the conduction takes place due to

Choose an answer

Electrons only

Holes only

Electrons and holes

Electrons and ions

Charge on proton is

Choose an answer

1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

Motional emf is called motional:

Choose an answer

Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Choose an answer

outwards

inwards

in either way

none of these

In a transistor, collector current is controlled by

Choose an answer

Collector voltage

Base current

Collector resistance

All of the above

A two Kg block is held 1 m above the floor for 50 seconds, the work done is:

Choose an answer

Zero

10.2 J

100 J

980 J

During each cycle, alternating voltage reaches a peak value

Choose an answer

One time

Two times

Four times

A number of times depending on the frequency

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Choose an answer

300°C

573°C

600°C

743°C

Work done in lower and bucket into the well is:

Choose an answer

Zero

Positive

Negative

None of these

The r.m.s. value of alternating current is equal to its maximum value at angle of

Choose an answer

60°

45°

30°

90°

γ-rays behave like a particle because they explain the

Choose an answer

Compton effect

Photoelectric effect

Pair-production

all the above

More Classes

Other Links

Physics ECAT Pre Engineering Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer