Question # 1

Which one of the following is correct?

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V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

When a nucleus emits an alpha particle, it atomic mass decreased by

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2

1

4

3

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

When weight of an object falling freely becomes equal to the drag force, then the body will move with

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increasing speed

decreasing speed

constant speed

none of them

A ball of mass m moving with uniform speed collides elastically with another stationary ball. The incident ball will lose maximum kinetic energy when mass of the stationary ball is

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m

2 m

4 m

Infinity

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

A spring of constant k = 0.4 N m^-1_{is to be extended thorugh 10 cm at a place where g = 10 m sec}^-2. The mass to be suspended should be:

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4 gms

0.4 gms

40 gms

None of these

The property of light which does not change with the nature of the medium is

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Frequency

Amplitude

Wavelength

None of these

Which of the following is a non-conservative force

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Nuclear force

Elastic force

Electrostatic force

Viscous force

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

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

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Decreases

Increases

Remain same

None of the above

A truck and a car are moving with equal velocity. On applying the brake both will stop after certain distance then

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Truck will cover less distance before rest

Car will cover less distance before rest

Both will cover equal distance

None

A normal to the waves front showing direction of propagating of wave is called

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Photon

Particle

Ray

Line

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

The locus of all points in a medium having same phase of vibration is called:

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Crest

Trough

Wavelength

Wavefront

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

If solid sphere and solid cylinder of same mass and density rotate about their own axis,the moment of inertia will be greater for

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Solid sphere

Solid cylinder

Both

Equal both

For a given angle of projection if the time of flight of a projectile is doubled the horizontal range will increases to:

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Four times

Thrice

Once

Twice

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