Question # 1

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

The A.M. transmission frequency range from

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500-1000 KHz

540-1600 KHz

300-490 KHz

900-2040 KHz

Most of the electrons in the base of an NPN transistor flow

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Out of the base lead

Into the collector

Into the emit

Into the base supply

The rectangular components of a vector are equal in magnitude when the vector makes and angle _______with their x-component:

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0°

30°

45°

60°

A physical system under going forced vibrations is known as

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Simple harmonic oscillator

Compound harmonic oscillator

Physical harmonic oscillator

driven harmonic oscillator

The current produced by moving a loop of a wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

Neutrons are

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positive charge

negatively charged

massless

neutral

The SI unit of flux density is.

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Tesla

Weber

Gaun

Weber/meter

Electric lines of force

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Intersect each other

Are always parallel

Are always anti-parallel

Never intersect

None of these

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

The number of translation degress of freedom for a diatomic gas is

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2

3

5

6

Time of flight of projectile is

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Vi sinθ /g

2Vi Sinθ /g

2Vi sinθ/g

None

N-kg^-1is the unit of

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Velocity

Force

Acceleration

None of these

In Huygen's wave theory the locus of all points in the same state of vibration is called

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A half-period zone

Vibrator

Wave front

A ray

Semiconductors, like Ge or Si at room temperature becomes a

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Semiconductor

Conductor

Insulator

None of these

The substances in which, atom are so oriented that their field support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

Shear modulus for mercury is

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0

12

27

42

Average acceleration is the difference of two vectors divided by a scalarΔt. Therefore

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The atom or molecules in crystalline solids are held together by:

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Cohesive force

Adhesive force

Gravitational force

Magnetic forces

If P is the pressure of gas than K.E per unit volume of gas is

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P/2

P

3/2 P

2P

The rotational analogue of Newtons second law of motion is

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mr²α

mrα

mrα²

None of these

When a force is applied on a body, several effects are possible. Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

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