Question # 1

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

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positive

negative

zero

any one of them

A projectile on its path gets divided into two pieces at its highest point. Which is true?

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Momentum increases

Momentum decreases

Kinetic energy increases

Kinetic energy decreases

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

Which of the following is a state variable

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entropy

pressure

volume

all of them

When a wall is pushed by a person very strongly, he has done:

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Maximum work

Zero work

Positive work

Negative work

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

Area under the force displacement graph gives

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Power

Work

Heat

Energy

An A.C varies as a function of

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Current

Voltage

Time

Charge

The mass of fluid passing through any cross-section per unit time is called

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electric flux

magnetic flux

mass flux

none of them

A body with frequency of would complete one vibration in:

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f seconds

1/f seconds

1 second

f²second

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

The absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

10⁶electrons are moving through a wire per second, the current developed is

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1.6 x 10^-19

1 A

1.6 x 10^-15A

10⁶A

The graph showing the variation of displacement with time is a:

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Sine curve

Straight line

Parabola

None of these

In the formula P = N₀KT, N₀denotes:

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Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

Amplitude in SHM is equivalent to ______ in circular motion

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Diameter

Radius

Circumference

None of these

The nature of radiations emitted by a hot body depends upon its:

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Metarial

Temperature

colour

Volume

Length

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

A ray passing through optical center of a lens, after refraction:

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Passes through focus

Go deviated

Retraces its path

Both B and C

The r.m.s value of a.c. current is always

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positive

negative

zero

all of these

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

F = I(L x B) is a

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vector

scalar

unit vector

none of these

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

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