Question # 1

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10Ω

1Ω

0.10Ω

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

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

Generally a temperature scale is established by

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one fixed point

two fixed point

three fixed point

four fixed point

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

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Q/4πr²

2Q/4πr²

Q.d

Zero

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

The concept of field theory was put forward by

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Franklin

Kepler

Oersted

Michael Faraday

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

If a particle covers half the circle of radius R with constant speed then

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Momentum change is mvr

Change in KE is 1/2 mv²

Change in KE is mv²

Change in KE is zero

The dichronic substances are used in the process getting plane polarized light

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Selective absorption

Refraction through crystals

Reflection from different surfaces

None of these

nuclear physics deals with

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Atom

Atomic nuclei

Elementary particles

Light

In Michelson's interferometer , the plates are placed in front of incident ray at an angle of:

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45^o

60^o

90^o

120^o

In a full wave rectifier, the diode conducts during

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Both halves of the input cycle

A portion of the positive half cycle of the input

Positive half cycle of the input

Both halves of the input cycle

An un-power and un-guided missile is called a

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rocket

ballistic missile

guided missile

none of them

The angle between the vector 2i + 2j and the y-axis is

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Tan^-1 (3/2)

Tan^-1 (2/3)

Sin^-1 (2/3)

Cos^-1 (3/2)

X-ray diffraction has been very useful in determining structure of

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Hemoglobin

Double helix structure of DNA

Blood speed

a and b

In case of point source of light, shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

Is there any physical distinction between the valence and conduction band

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Yes

No

Very small

None of these

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decreases

The density of blood decrease at high altitudes

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