Question # 1

Two forces of 10N and 8N are applied simultaneously to a body. The maximum value of their resultant is:

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20 N

-2 N

18 N

36 N

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

A changing magnetic flux creates around itself

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An electromotive force

An electric field (changing electric flux)

Magnetic field

None of the above

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

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C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

0.10 cm can be written as:

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1.0 x 10^-2m

1.0 x 10^-3cm

1.0 x 10^-4cm

1. x 10^-4m

The time of flight of a projectile motion equal to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

The restoring force is ______ and opposite tot he applied force within ______

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Equal, Elastic limit

Different, The walls of the laboratory

Different, Elastic limit

None of these

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

Which one of the following has larger value of relative permitivity E_rat room temperature?

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Vaccum

Air

Glass

Water

The wire used in resistance thermometer is platinum wire because

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Its resistance increase uniformly with rise in temperature

It is inert

Its melting point is very high

All of the above

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream line body

None of these

Super conductor offers no resistance to

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Thermal agitation

Electric current

Induced current

None of these

If the instantaneous velocity of a body does not change, the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

When we jump out of a boat standing in water moves

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Forward

Backward

Sideways

None of these

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

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2W

W

W/2

Zero

If r = 1.0 × 10^-4 m ρ = 1000 kgms^-3 η = 19 × 10^-6 kgm^-1 s^-1 find V_t terminal velocity

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1.02 × 10^-3 ms^-1

0.12 × 10^-3 ms^-1

1.1 ms^-1

1.21 ms^-1

Basic principle of an optical fibre is

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Reflection

Scattering

Polarization

Total internal reflection

When the temperature of source and sink of heat engine become equal than efficiency of heat engine will

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Maximum

Minimum

Negative

Zero

The shaft of a motor is rotating at constant angular velocity of 3000 rpm. The angle turned per second is

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100 π rad/s

200 π rad/s

300 π rad/s

400 π rad/s

The combination of solenoid and a specimen of iron inside it make a power full magnet called

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Horse shoe magnet

Bar magnet

Electromagnet

10^-10 to 10¹⁸

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