Question # 1

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

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9.4 kHz

940 kHz

94 kHz

None of these

The maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

If we draw a graph between d (along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis, then area under this straight line represents:

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Power

Work

Pressure

None of these

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

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0°

90°

180°

None of these

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random position

do no oriented along external field and also do not returns to originally random position

none of them

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

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The faster one

Depends on their mass

The slower one

Both will reach simultaneously

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

The natural arrangement of colours in the spectrum of white light spectrum is

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

The value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

Through which character we can distinguish the light waves from sound waves

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Interference

Refraction

Polarization

Reflection

A current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

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5μF

20μF

10μF

15μF

An object moving through a fluid experiences a retarding force called a

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frictional force

terminal force

opposing force

drag force

If the value of C in a series RLC circuit is increased, the resonant frequency

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Is not affected

Increase

Remains the same

Decreases

The volume of universal gas constant R is:

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8.314 J/K mole K

8314 J/K mole K

8.314 J/mole K

None of these

Which of the following phenomenon proves the particle nature of light

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interference

diffraction

photoelectric effect

none of these

The information from far side of the universe are gathered by:

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Radio telescope

Microscope

Telescope

Spectro scope

An ideal choke (used along with fluorescent tube) would be

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A pure resistor

A pure capacitor

A pure inductor

A combination of an inductor and a capacitor

The mechanics, which deals with the objects moving with velocities approaching that of light is called

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Relativistic mechanics

Wave mechanics

Quantum mechanics

Statics

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

The range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°?

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400 m

300 m

200 m

100 m

At constant temperature, if the density of the gas is increased, its pressure will:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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number of photoelectrons

size of the photoelectrons

charge on photoelectrons

K.E of photoelectrons

The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

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F=eVB

F=e²V/B

F=e/VB

F=B²/ev

Amorphous solids are also more like

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crystalline solids

gases

liquids

any one of them

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

The electric field due to an infinite long thin wire at a distance R varies as

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1/R

1/R²

R

R²

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