Question # 1

Bernoulli's equation is important in the field of

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Electrical circuit

Magnetism

Photoelectric effect

Flow of fluids

The equation of continuity is

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A₁A_{2 = V}₁V₂

A_1/_V_{1 =}A_2/V₂

_V_1/A₁₌V_2/A₂

A₁_V_{1 =}A₂V₂

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

Electric generators which convert mechanical energy into

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solar energy

thermal energy

kinetic energy

electrical energy

When a conductor is moved across a magnetic field, the redistribution of charge sets up:

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Magnetic field

Electrostatic field

Electromagnetic field

All of these

None of these

A body can have constant velocity when it follows:

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A circular path

A rectilinear path

Trajectory of a projectile

None of these

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

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Germanium

Silicon

Arsenic

Gallium

Indium

the current is pass through the straight wire. The magnetic field established around it has its lines of force:

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Circular and endless

Oval in shape and endless

Straight

Parabolic

All are true

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

A negative sign is assigned to quantities where direction is opposite to that of

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final velocity

initial velocity

instantaneous velocity

all of them

Every streamline can

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Not cross each other

Cross each other

Some what cross each other

None of these

A body is dropped from a tower with zero velocity reaches ground in 4 seconds.The height of tower is about

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80 m

20 m

160 m

40 m

The terminal velocity of for a water droplet of radius 10^-5 m is of the order of

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1 cm/s

1 mm/s

1 nm/s

1 μm/s

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

Each domain contains the atoms of range of

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10^-10 to 10¹⁸

10¹⁰ to 10¹⁶

10¹² to 10¹⁷

10¹² to 10¹⁶

In Millikan's oil drop experiment an oil drop is observed to move vertically upwards. The upward motion of the drop is due to

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Gravity

Viscosity

Buoyancy

Electric Field

The angle with the horizontal at which an underwater swimmer will see the setting sun is

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91°

32°

49°

69°

The speed at which light travels within the material depends upon

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Refractive index of medium

Wavelength

Frequency

Intensity

Name of projectile is the same for the following pair of angles:

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0° and 45°

35° and 55°

15° and 60°

30° and 75°

If f = 5 cm and d = 25 cm then the magnification will be

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2

4

5

6

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