Question # 1

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

A galvanometer is an instrument used to

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measure voltage across a circuit

detect current in a circuit

measure current flowing through a circuit

none of these

The value of the potential difference across the depletion region for the case of germanium is

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0.3 V

0.5 V

0.7 V

0.9 V

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

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353.5V

250V

175V

zero

400V

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

When heat is removed from the system

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negative

positive

zero

any one of them

If the length of a simple pendulum is 0.25 m its time period would be

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1.0 s

2.0 s

3.0 s

4.0 s

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

The product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

A ball is dropped vertically down and it takes time t to reach the ground. At time t/2

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The ball had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

A magnetic force on an electron travelling with 10⁸ms^-1parallel to a field of strength 1 Wb m^-2is

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Zero

10⁵m

10^-10N

10⁸N

In a transistor, if the central region is n-type, then this type of transistor is known as

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n-p-n transistor

p-n-p transistor

either of these

none of these

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

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Protactinium

Actinium

Uranium

Radium

Redon

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

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Time constant

Decay constant

None of these

All of above

The internal pressure of the blood is

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less than the external atmospheric pressure

greater than the external atmospheric pressure

equal to the external atmosphericpressure

none of them

A thermistor is a resistor which is:

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Light Sensitive

Heat Sensitive

Sound Sensitive

All of these

None of these

The analysis of fluid motion becomes simplified by using

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law of conservation

law of conservation of energy

both of them

none of them

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

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10Ω

20Ω

30Ω

40Ω

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

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-10 N

+10 N

+20 N

-20 N

One coulomb per second is equal to

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One volt

One ampere

One hom

One henry

Avo-meter is used of measure the

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current, voltage

voltage, resistance

resistance, current

current, voltage and resistance

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

The e/m of an electron moving in a circular path in a magnetic field is equal to

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V/Br

V/B²r²

V²/Br²

V²/Br

A body of mass 5 kg is acted upon by a total change n momentum will be:

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10 NS

100 NS

140 NS

200 NS

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