Question # 1

Which part of D.C motor reverses the direction of current through the coil every half cycle.

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The armature

The commutator

the brushes

The slips rings

An object is placed at the focus of a diverging lens The image is located at

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The focus

2 F

Infinity

Half away between the lens and the focus

The magnus effect is equivalent to

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Bernouli's theorem

Archimedes principle

Pascal's law

Blood pressure

The line passing symmetrically though the optical center of the lens is.

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Focal plane

Principal focus

Principal axis

Focal length

What is the cause of mirage in desert areas.

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Refractive index of atmosphere increases with height

Refractive index of atmosphere decreases with height

Refractive index of atmosphere remains constant

Scattering

Who developed the first atomic reactor.

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Bohr

Fermi

Rutherford

Taylor

One Tesla is equal to.

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1 N A-1

1 N m-1

1 N A -1 m

1 N A -1 m-1

Force acting on a test charge between the plates of a parallel plate capacitor is F. If one of the plates is removed teh force on the same test charge will be.

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Zero

F/2

F

2 F

Eddy current can be minimized by

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Moving the conductor rapidly

Moving the conductor slowly

Using a metallic core

Using a laminated core

With high frequencies capacitive reactance

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Increases

Decreases

Becomes double

Becomes half

The SI unit of magnetic flux is.

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N A-1

N m-1 A

N m A-1

N m-1 A-1

Which of the following has maximum specific heat.

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Glass

Iron

Brass

Lead

A 100 kg box is pulled 10 m across a frictionless horizontal surface by a 50 N force The change in the P.E. of the box a

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0 J

2 J

20 J

50 J

The point of which the whole weight of the body acts

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zero point

Centre of mass

Centre of gravity

Equilibrium

Which of the following is not a unit of plane angle.

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Degree

Radian

Gradian

Steradian

When a wire moves perpendicularly to a magnetic field, the induced emf does ot depends upon

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The velocity of the wire

The resistance of the wire

The flux density of the magnetic

The orientation of the wire field

Transistor are made from

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Plastics

Metals

Insulators

Doped semiconductors

Crystalline solids are of.

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Short range order

Long range order

Intermediate range

Plastics

In radiotherapy X-rays are used to.

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Treat cancer

Delect bone fracture

Cure heart diseasee

All of the above

If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules.

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Decreases

Remains constant

Increases

First increases then decreases

Why does a transformer have a core made of iron.

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Iron has a high melting point

Iron is a magnetic material

Iron potential and high current

Iron is a conductor of electricity

Angular moment is conserved due to

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Variable force

Constant force

Central force

Uniform force

A ray of light from air into glass The angle of incidence is 30o if the refractive index of glass in 1.52 The angle of refraction will be.

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16.7 ^o

19.3 ^o

29.6 ^o

39.3 ^o

A type of resistor whose resistance varies significantly with temperature is.

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Thermistor

Thermocouple

Strain gauge

Potentiometer

Who first discovered a similarity in nature of x rays and light rays.

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Roentgen

Bragg

Man Von Lave

Moseley

Temperature of a gas is related to.

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Total K.E. of the gas molecules

The K.E. of the centre of mass of the gas

The P.E. of the centre of mass of the gas

Total K.E. of the molecules w.r.t the centre of mass of gas

Which of the following electron wavelength is used in electron microscope.

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Short

Extremely short

Large

Moderate

The energy that must be added to separate the nucleus is called.

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Critical energy

Binding energy

Gravitational energy

Electrostatic energy

The electric supply line in houses works at 220 V what will be the amplitude of emf.

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120 V

331 V

220 V

440 V

Frequency less than 120 Hz are known as

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Infrasonic

Ultra sonics

Super sonics

Infrared

A resistor whose resistance decreases with increasing intensity is.

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Light dependent resistor

Thermistor

Thermocouple

Strain gauge

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