Question # 1

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

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2 N

- 2 N

18 N

36 N

The magnitude of the displacement is a line from initial position to final position which is

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straight

curved

either be curved or straight

none of them

According to the equation of continuity, when water falls from the tap, it's speed increases and its cross-sectional area

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decreases

increases

becomes zero

none of them

The resistivity of a substance depends upon the

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length

mass

area

temperature

INTELSAT operates at frequencies 4, 6, 11, 14 having unit of:

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KHz

MHz

GHz

BHz

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

The induced emf in a coil is proportional to:

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Magnetic flux through a coil

Rate of change of magnetic flux through the coil

Area of the coil

Product of magnetic flux and area of the coil

When the conductor moved across a magnetic field:

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Emf induced is similar to that of a battery

Emf induced gives rise to induced current

An emf induced across its ends

All are correct

None of these

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by

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F =q(v/B)

F=q²(v x B)

F=q(v x B)

F= vx B

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

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Charge Q

Potential V

Capacity

Energy U

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

When a body movies in a circle in the counter clockwise direction the angular displacement Δθ is taken as

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Positive

Negative

Both ways

None of these

Temperature of a system is defined as

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Initial K.E. of its molecules

Instantaneous K.E. of its molecules

Average K.E. of its molecules

All of these

A cell of negligible resistance and e.m.f 2 V is connected across a series combination of 2,3 and 5 ohms. The p.d. across the 3 Ω resistor is

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0.6 V

1/3 V

2/3 V

4/3 V

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

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Positive

Neutral

Negative

None of these

If the slits in YDS experiment are made closer, fringe spacing will

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Increase

Decrease

Remain same

None of these

The magnitude of vector A,B and C are respectively 12,5 and 13 units and A + B = C then the angle between A and B is

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0

π

π/2

π/4

A tall chimney has the advantage/advantages

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Reduce top pressure

Force

Upward flow of smoke

All of these

Satellites are held in orbits by gravitational pull by Earth and are put into orbit by

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Initial velocity

Rockets

Escape velocity

None of these

The electrical behavior of semiconductor depends on the material purity which is

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Sensitive

Extremely sensitive

Non-sensitive

None of these

At what point/points in its path does a projectile have its maximum speed

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At the point of projection

At the point where its strikes the ground

Both

None of these

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