Online Test

Question # 1

A tank full of liquid has an orifice 4.9 m below the surface level in the tank, the velocity of out coming liquid is

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4.9 ms^-1

9.8 ms^-1

2 x 9.8 ms^-1

4 x 9.8 ms^-1

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

x_ocos²wt

Mass defect per nucleon is called

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Binding energy of nucleus

Packing fraction

Average energy of nucleus

Average energy of reaction

The drag force increases as the speed of the object

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Decreases

Increases

Decreases rapidly

None of these

The distance between different interference fringes are:

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Variable

Same

Different

None of these

The only significant motion possessed by the mono-atomic gas molecules is:

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Translatory

Rotatory

Vibratory

None of these

The velocity of X rays is equal to that of

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Speed of sound

Speed of alpha particles

Speed of electron

Speed of light and gamma rays

If current "I" flows steadily through a resistor "R" for time "t" then heat energy supplied to the system can be defined as:

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Power/Time

Powr x applied voltage

Power x time

None of the above

a constant force F is applied to keep the particle moving with uniform velocity V.Then the power required is

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1/2 FV²

FV²

FV

F/V

Which one of the following groups have quantities that do not have the same dimensions?

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Velocity,speed

Pressure,stress

Force,impulse

Work,energy

In case of photoelectric effect,amount of energy in each photon depends on the

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Rest mass

Frequency of incident light

Momentum

Wavelength

In electronic quenching

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A gas is used

A positive voltage is used

A negative voltage is used

A large negative potential is used

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Aligns itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both C and D

In light waves, the components of electric and magnetic fields are

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parallel to each other

anti-parallel to each

right angle to each other

none of them

The half-life of ratio-active element depend on

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Temperature

Pressure

Nature of element

Amount of radioactive substance

The angular momentum of a particle is given as

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L = m × p

L = p × V

L = r × p

None of these

Every source of current converts some non-electrical energy into

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Chemical energy

Mechanical energy

Solar energy

All of these

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

For constructive interference path difference should be

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Integral multiple of λ/2

Integral multiple of λ

Odd integral multiple of λ

Odd integral multiple of λ/2

If a 40 watt bulb is on for 2 hours how much heat is generated

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280 x 10⁵ j

288 x 10³ j

80 j

400 j

C.R.O is a device consist of

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A grid

Indirectly heated cathode

Three anode

All of them

Which one of the following bulbs has the least resistance?

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100 watt

400 watt

500 watt

60 watt

If the atmospheric pressure is doubled, the speed of sound:

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Increases by 61 cm sec^-1

Decreases by 61 cm sec^-1

Remains constant

None of these

At disstolic pressure

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Flow become laminar

Gurgle disappears

External pressure becomes equal

All of these

The time of period of a simple pendulum as seen by an astronaut in a spaceship is

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84.6 min

0.248 m

∞

Minimum

The average kinetic energy of the molecules of the object is called its

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Heat

Temperature

Hotness

Coldness

The linear momentum of the body is defined as

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p=ma

p=1/2ma

P= mv

p=1/2mv

The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation

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The intensity increases

The minimum wavelength increases

The intensity remains unchanged

The minimum wavelength decreases

The perpendicular distance from the axis of rotation to the line of the action of force is called

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Linear distance

Angular distance

Momentum arm

None of these

Which of the following processes will result into fission reaction?

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₉₂U²³⁵ is bombarded with fast moving neutrons

₉₂U²³⁵ is bombarded with thermal neutrons

U²³⁸ is bombarded with slow moving neutrons

U235 being unstable breaks into smaller fragments

The Newton's formula for the velocity of sound is

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The units of torque and couple are

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N-m and N-m²respectively

N-m and N

N-m^-1for both

N-m²and N-m respectively

SHM is type of ___________ motion

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Vibratory

Linear

Circular

None of these

A common emitter transistor amplifier has a current gain of 50.If the load resistance is 4k and input resistance is 500Ω The voltage gain of the amplifier is

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160

200

300

400

The half-life of radioactive element depends upon

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Nature of substance

Temperature

Pressure

All of these

A highly direction beam of ultrasonic waves can be made to travel in water in

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Many meters

Many kilometer

Several kilometers

None of these

The velocity of the body changes at different points. It is maximum at

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Mean position

Extreme position

Between extreme and mean position

None of these

According to Huygen,every point on a wavefront may be regarded as a.........of secondary wavelets.

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Base

Source

Producer

Origin

In the thin film, the path difference of two reflected ray depends upon

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Thickness of the film

Nature of the film

Angle of incidence

All of these

How the energy changes in antinodes all at their extreme displacements

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Wholly P.E.

Wholly K.E.

Changes from P.E. to K.E.

a and b

When in a non-inverting amplifier R₁ = ∞ and R₂ = 0 then circuit functions as

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Integrator

Subtractor

Comparator

Unity follower