Question # 1

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

Amplitude in SHM is equivalent to_____ in circular motion:

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Diameter

Radius

Circumference

None of these

An induced current can be produced by

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Constant magnetic field

Changing magnetic field

Varying electric field

Constant electric field

None of these

The decrease in velocity per unit time is called:

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Variable Acceleration

Average Acceleration

Retardation

None of these

The r.m.s. value of alternating current is equal to its maximum value at angle of

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60°

45°

30°

90°

The equation of continuity

A₁V₁= A₂V₂is for the flow of

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an ideal fluid

an incompressible fluid

a non visconcous fluid

all of the above

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

Self inducede e.m.f. is also called

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Motional e.m.f.

Thermistor

Electrostatic induction

Back e.m.f

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

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Remains constant

Decreases

Increases to infinity

Reduced to zero

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

Laws of motion are not valid in a system which is

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inertial

non-interial

at rest

moving with uniform velocity

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

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5 cm

10 cm

15 cm

20 cm

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

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0.1 V

8 V

2 V

0.5 V

Which one of the following is an example of SHM:

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Motion in a plane

Motion in a swing

Motion in a car

None of these

The results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

Which of the following are the units of intensity of light

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Pois

Lux

Siemen

Candela

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

Density is defined as:

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Mass per volume

Volume per mass

Mass x volume

Mass per length

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec^-2comes out to be

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980 N

580 N

1380 N

Zero

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

The motion in a plane is the motion in

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one dimension

two dimension

three dimension

four dimension

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

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