Question # 1

Bracket and plunk series of spectral lines lye in the

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Visible region

Ultraviolet region

Far infrared region

Infrared region

Current gain of a CE amplifier is 50, ITS hfe is about

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25

50

75

100

Photocells are used for

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Security systems

Counting systems

Automatic door system

All of the above

Torque is equal to.

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The product of magnitude of force and acceleration

The product of magnitude of force and momentum

The product of magnitude of force and displacement

The product of magnitude of force and angular velocity

Which magnetic properties is inherent in all materials.

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Para magnetism

diamagnetism

Ferromagnetism

demagnetism

A pulse on the string is inverted when it is reflected from

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Free end

Fixed end

Either of the two

Rubber cord

The equation of parabola is.

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y= bx - ax2

x = by - ay2

y = ax + bx2

x = a -by2

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

One particle having zero mass and zero charge is.

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Positron

Electron

Neutrino

Neutron

Which quantity is common for systems in thermal equilibrium.

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Heat

Temperature

Momentum

Specific heat

Object may acquire an excess or deficiency of charge by

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Rubbing them together

Grounding them

Applying coulomb's principle

Shielding them

In compound microscope, image formed by the eyepiece is

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Real

Invented

Erect

Diminished

If positive terminal of the battery is connected to n-type and negative terminal of the battery is connected to p-type then the diode is.

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Saturated

A gate

Forward biased

Revere biased

The susceptibility of a paramagnetic material is

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negative

Positive

Zero

Infinity

The combined resistance of two identical resistors, connected in series is 18 Mega Their combined resistance in a parallel arrangement will be.

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2 Mega

4 Mega

8 Mega

12 Mega

If the pressure of a gas is doubled, then its thermal conductivity will

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Increases

Decreases

Remain constant

Be zero

linear magnification is the ratio between the

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Distances of object and image from mirror

Distances of object and image from the focal point

Distance of image and object from the mirror

Distance of image from object and the distance of object from mirror

When an object moves with a very high speed the length in the direction of motion.

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Contracts

Expands

Remains the same

Becomes infinity

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

When net torque acting on a system is zero which of the following will be constant.

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Force

Angular momentum

Linear momentum

Linear impulse

at room temperature the p.d. between the two sides of depletion region for silicon is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

If a car is to gain momentum it must.

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Lose inertia

accelerate

Move rapidly

Lose weight

Drag force between two layers under consideration depends on

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Distance between the layers

Surface area of layers

Relevant velocity between them

All of the above

The helium nucleus does not contain

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Two electrons

Two neutrons

Two protons

Six nucleons

The dimensions of universal gravitational constant G are.

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[MLT-2]

[ML -2T-2]

[M-1L2T-2]

[ML-1T-1]

Light wave are

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Longitudinal

Transverse

Sometimes longitudinal and sometimes transverse

Neither longitudinal nor transverse

The corss product of two vectors is zero when they

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Are parallel to each other

Are perpendicular to each other

Are at an angle of 120 ^o

Both are equal

If the resultant of all the forces acting on a body is zero then the body is in

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Translation equilibrium

Rotational equilibrium

Equilibrium

Dynamic equilibrium

The image of an object 5 mm high is only 1 cm high. The magnification of the lens is

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0.2

0.5

1

2

The angle of incidence that causes the refracted ray in the rarer medium to bend though 90^o is called.

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Critical angle

solid angle

Plane angle

Acute angle

Inserting a di electric between the plates of a charged parallel plate capacitor.

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Decrease the capacitance

Leaves teh capacitance the same

Encourages breakdown between the plates

Reduces the electric intensity between the plates

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