Question # 1

When a shell explodes in mid-air, its fragments fly off in

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only one direction

in two direction

different directions

a particular direction

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°. the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`

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Minimum work

Maximum work

Zero work

Negative work

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done in 25J. The angle which the force makes with the direction of motion will be

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60°

90°

30°

0°

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

When the mass of the colliding body is much larger than the mass of the body at rest, its velocity after collision.

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Becomes half

Becomes zero

Ramains same

Becomes double

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

If a mass of 10 gm is suspended from a spring of k = 9.8 Nm^-1, then the extension will be:

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1 cm

1 m

10 mm

None of these

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

The appearance of the colour in the soap (oil) film results from:

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Dispersion

Interference

Reflection

Refraction

When two axis are drawn at right to each other are called

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Coordinate axes system

Cartesian system

Rectangular coordinate system

All of these

Finger prints on paper are identified by sprinkling fluorescent powder on it and observing it under

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Sun light

Sodium light

Infrared

UV

Acceleration produced in a body by a force varies

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inversely as the applied force

directly as the mass of the object

directly as the mass of the body

none of them

The magnetic field produced due to the current in a straight wire is proportionalto the :

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Electric current

Conducting material

Length of the wire

Diameter of the wire

If a ball comes back to its starting point after bouncing off the wall several times, then its

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total displacement is zero

average displacement is zero

none of them

both of them

A test charge q is the charge which is

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Very small

Very strong

A point charge

All of them

The cohesive forces between atoms, molecules or ions in crystalline solids maintain

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short range order

long range order

both of them

none of them

The rectangular components of force 5 dyne are

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3 and 4 dyne

2.5 and 25 dyne

1 and 2 dyne

2 and 3 dyne

One angshom is equal to?

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10^-8cm

10^-6m

10^-10nm

10^-8nm

Viscosity of air is

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0.019x10³ Nsm^-2

0.019x10^-3 N-sm^-2

0.019x10³ Nsm^-2

Using a graded index fibres the time difference is reduced to about

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0.5 ns per km

1.0 ns per km

2.0 ns per km

2.3 ns per km

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