Online Test

Question # 1

Two physical quantities, of which one is a vector and the other is a scalar, having same dimensions are

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Torque and momentum

Power and pressure

Impulse and momentum

Torque and work

Acceleration produced in a body by a force varies

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inversely as the applied force

directly as the mass of the object

directly as the mass of the body

none of them

Energy can be stored in

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Magnetic field of a capacitor

Electric field of a capacitor

Dielectric

None of these

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle.the motion of the particle takes place in a horizontal plane.It follows

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Linear momentum is constant

Velocity is constant

It moves in a circular path

None of these

One rad (radiation absorbed dose) is

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0.01 Gray

0.03 Gray

0.05 Gray

None of these

The output of NAND gate is 0 when

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all the inputs are at 1

all the inputs are at 0

at least one of the inputs is at 1

none of them

In insulators

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Valence band is partially filled with electrons

Conduction band is partially filled with electrons

Conduction band is empty and valence band is filled with electrons

A monochromatic source of light gives light of

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one colour

two colours

four colours

seven colours

The reactance of a coil when used in the domestic A.C power supply (220 volts,50 cycles per second) is 50 ohms.The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

Laser beam can be used to generate

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One dimensional images

Two dimensional images

Three dimensional images

None of these

During adiabatic expansion change of 2 moles of gas the internal energy is 100 j, the work done this expansion is

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Zero

-100 J

200 J

100 J

Earth-sun travel around the galaxy is

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220000 ms^-1

230000 ms^-1

210000 ms^-1

200000 ms^-1

There will be no change in _______ of light entering glass

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Velocity

Frequency

Direction

Wavelength

If the diameter and mass of the earth become two times their present values, then the weight of an object on the surface of the earth will

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Remain unchanged

Become half

Become one fourth

Be doubled

At every degree Celsius rise of temperature, the volume of a given mass of a gas at constant pressure increases by

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1/273 of its value at 0°C

1/373 of its value at 0°C

1/173 of its value of 0°C

1/700 of its value at 0°C

A conductor which obeys Ohm's law is called

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Ohmic device

Non-ohmic device

Neither ohmic nor non-ohmic

None of these

Dimension of momentum is

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ML^-1T

M^-1LT

MLT

MLT^-1

The binding energy of deuteron is 3.5729 x 10^-13J, convert it into eV

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2.13 MeV

2.15 MeV

2.23 MeV

2.27 MeV

Shear modulus for brass is

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36

39

51

65

Unified mass scale means that atomic mass is expressed in:

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Kg

Gram

Atomic mass unit

u only

Both C and D

Which of the following is not an advantages of using optical fibres over copper cables?

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signal attenuation

number of signals carried per wire

cost of installation

none of the above

An airplane flies 400 m from north and then files 300 m south and then flies 1200 m upwards then net displacement is

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1200 m

1300 m

1400 m

1500 m

Digital circuits can be made by repetitive use of

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AND gate

OR gate

Not gate

NAND gate

α-particles emitted with the

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Double energy

Same energy

Half of the energy

None of these

Three resistors of 2, 3 and 6 ohms are connected in parallel, their equivalent resistance is

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Ω

3Ω

5Ω

7Ω

Mass spectrograph is used to

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Separate isotopes of an element

Measure masses of isotopes

Find abundance of isotopes

All

At what temperature the speed of sound is double its speed in the air at 0°C

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1092°C

819°C

546°C

273°C

The speed of sound

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Increases with the increase of the gas pressure

is not affected with the change in the gas pressure

decreases with the increase of the gas pressure

none of them

The phase at the positive peak is

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∏/2

∏

3 ∏/2

2∏

A signal is amplified at the output without any change of phase, if it is applied at the

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inverting input

non-inverting input

at any of the input

none of them

If a transverse wave travelling in a denser medium is incident on a rare medium, it is reflected such that it undergoes a change of

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0°

90°

135°

180°

By the slope of velocity time, we can determine the

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Acceleration

Constant velocity

Average velocity

Average acceleration

The value of R/Z is equal to

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Cos θ

sin θ

tan θ

θ

Which is modified form of galvanometer?

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potentiometer

battery

voltmeter

slide wire birdge

When an excited helium atom collide with neon atom, each transferring additional energy of

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0.09 eV

0.08 eV

0.06 eV

0.05 eV

The SI unit of conductance is

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mho

siemens

(ohm)^-1

all of them

The potential energy of a particle executing SHM with amplitude A is E at the extreme position What is its kinetic energy at y = A/2?

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0.86 E

0.75 E

0.50 E

0.25 E

Magnetic field is a:

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Vector quantity

Scalar quantity

Vector as well as scalar quantity

Neither A nor B

Any of A or B

Shunt resistance is called

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By pass resistor

Specific resistance

Reactance

None of these

The speed of flying bee is

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1 ms^-1

5 ms^-1

8 ms^-1

10 ms^-1

The molecules or ions in a crystalline solid are

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static

not static

randomly moving

all of them