Question # 1

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.

if centripetal acceleration is 9.8 m/sec², then its angular velocity in rad/sec is:

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22/7

7

14

21

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

A person is sitting in a traveling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is

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Moving forward and gaining speed

Moving forward and losing speed

Moving forward with uniform speed

Moving backward with uniform speed

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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photo diode

light emitting diode

photo voltaic cell

none of these

Absolute motion cannot be detected

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in its own frame of references

in a different frame of references

both in its frame and different frame of references

none of these

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

In n-p-n transistor, emitter base junction is kept

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reversed

forward biased

may be reversed or may be forward biased

none of these

A second's pendulum is a pendulum whose time period is

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1 second

2 seconds

3 seconds

4 seconds

The fundamental frequency of a closed organ pope is 50 Hz. The frequency ofsecond over tone is

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100hz

150hz

60hz

250hz

First law of thermodynamics is merely a statement of law of conversation of:

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Energy

Angular momentum

Change

Linear momentum

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

Colours seen on oily water surface by the incident white light is due to

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Diffraction

Interference

Refraction

Reflection

If it is assumed that a frictional force f is present, during the downward motion their

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mgh - f = 1/2 mV²

2mgh - f = 1/2 mV²

mgh - f = 1/2 mV²

None of these

Direction of torque can be found out by

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head to tail rule

parallelogram rule

left hand rule

right hand rule

Which of the given pair have same dimension

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Stress, pressure

Elastic modules, pressure

Stress, elastic modules

All have same dimension

In time of flight, the body the covers the distance

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Maximum

Zero

Minimum

None of these

The nonrenewable energy source is

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Sunlight

Hydroelectric

Uranium

None of these

A lens behaves as a converging lens in air and a diverging lens in water the refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

A fly wheel of moment of inertia 500 kgm² is rotating at a angular speed of 6 rad s^-1. What torque is need to stop the wheel in 3 sec ?

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500 Nm

100 Nm

1500 Nm

2000 Nm

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