Question # 1

During transition, atom cannot emit

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Visible light

Ultraviolet radiation

Infrared radiations

gama rays

If the transformer turns ratio is 2 and the impedance eof primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

Which of the following medium can transmit both transverse and longitudinal waves.

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Solid

Gas

Liquid

Plasma

In electric magnetism , the additional fundamental quantity that is chosen as a basic unit is called.

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Electric potential

Electric fierce

Electric charge

Magnetic force

The process due to which current flows only during alternate half cycle is known as.

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Filtration

saturation

Half wave rectification

Full wave rectification

When two point charges of equal magnitude and opposite sign exist very close to one another the arrangement is called.

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An electric dipole

An amperian current

A null charge

A neutral source

In a diffraction pattern, the width of any fringe is.

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Directly proportional to slit width

Inversely proportional to slit width

independent of slit width

Zero

The mass that appears in Newton's second law is known as.

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Rest mass

Gravitational mass

Inertial mass

Weight

Short sightedness in the eye occurs due to the.

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Contraction of eyeball

Increases in focal length of eye lens

Reduction in focal length of eye lens

Reduction in distance between retina and eye lens

There are how many modes of operations of a BJT.

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2

3

4

5

The quality of sound

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Decreases with pitch

Varies directly as its pitch

Varies inversely as its pitch

Depends upon the overtones present there

A force of 20 N is applied on an elastic spring if the extension produced in the springs to cm, the value of spring constant.

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2 Nm-1

20 N m-1

200 N m-1

2,000 N m-1

The process in which no heat enters or leaves the system is called.

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Isdobaric

Isochoric

Isothermal

Adiabatic

A number of spherical capacitors of different radii have same potentials The surface charge density on them

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I equal

Is proportional to their radii

Is inversely proportional to their radii

Is inversely proportional to square of their radii

A car is travelling on a level highway at at speed of 15 m s-1. A braking force of 3,000 N brings the car to stop in 10 s The mass of the car is.

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1500 kg

2,000 kg

2,500 kg

3,000 kg

Which of the following phenomenon is caused by the different speeds of light in differed optical media.

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Reflection

Refraction

Diffraction

Total internal reflection

The coulomb's law is valid for the charges which are.

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Moving and point charges

Moving and non point charges

Stationary and point charges

Stationary and large size charges

Which of the following phenomenon cannot be understood by quantum theory.

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Photo electric effect

Compton effect

X-Rays production

Interference

The same notes being played on sitar and veena differ in.

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Pitch

Quality

Both quality and pitch

Neither quality nor pitch

The strength of the magnetic field around the current carrying conductor is

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Smaller near the conductor

Greater near the conductor

constant everywhere

Changing everwhere

A girl weighing 400 N takes 4 s to run up the stairs How much P.E. does she gain if height of the stairs is 3 m.

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120 J

400 J

200 J

1200 J

the ratio of applied stress to volumetric strain is called.

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shear modulus

Bulk modulus

Young's modulus

elastic limit

The perceived fundamental frequency of a sound is called.

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Pitch

Timber

Loudness

Wavelength

The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days.

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2 mg

4 mg

8 mg

18 mg

A freshly made sample of radioactive material gives a count rate of 8,000 counts per minute After twenty days it gives a count rate of 500 counts per minute What is the half life of the materials.

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5 days

10 days

40 days

20 days

A body is in a static equilibrium, only when it is

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Moving with uniform velocity

Moving with variable velocity

Moving with uniform acceleration

at rest

A body of mass 8 kg moves along a circle of radius 4 m with constant speed of 88 m s-1 The centripetal force on the body is.

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10 N

128 N

48 N

148 N

The change in the dimensions of a body produced by the action of the deformation force is known as.

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Strain

Stress

Tensile strain

Tensile stress

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

All particles, of a wave front vibrate

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In same phase

In opposite phase

Upward down

Left and right

What is the overall gain, if three amplifiers each with a gain of 30 are cacaded.

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30

90

270

27,000

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