Question # 1

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

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

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Crest

Trough

Wavelength

Wave-front

Two vectors having different magnitudes:

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Have their directions opposite

May have their resultant zero

Cannot have their resultant zero

None of these

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

A laborer carrying a load on his head moves from the rest on a horizontal road to another point where he comes to rest. He has done:

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Minimum Work

Maximum Work

Zero Work

Negative Work

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

A resonance curve for RLC series circuit is a plot of frequency versus

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Voltage

Current

Impedance

Reactance

The motional e.m.f depends upon the

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Length of a conductor

Strength of a magnet

Speed of the conductor

All of the above

When the pn-junction is in reversed biased, current flows through the junction due to the

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majority carriers

minority carriers

either of them

none of them

The magnitude of i² in scalar product is

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Zero

1

Less than 1

Greater than 0

The linear acceleration of the particle of mass m describing a horizontal circle of radius r with angular speed ω is

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rω

ω/r

rω²

r²ω

A fixed mass of a gas is at a pressure P. if its volume and absolute temperature are both doubled, the new pressure is

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P/4

P/2

P

2P

The substances in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The expression for the terminal velocity V_t when mass of the droplet is considered is

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V^t = 2grρ/9η

Vt = 4grρ/9η

V_t = 4gr²ρ/9η

V_t = 4gr³ρ/9η

In a hydroelectric power station, the height of the dam is 10 m. How many kg of water must fall per second on the blades of a turbine in order to generate 1 MW of electrical power ? Take g = 10 ms^-2

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10³ kgs^-1

10⁴ kgs^-1

10⁵ kgs^-1

10⁶ kgs^-1

Which one of the following phenomena is not explained by Huygen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of spectra

Moment of inertia of a sphere is

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1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

Power is defined as

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P = ΔV/Δt

P = ΔW/Δt

P = mV/t

P = mt/V

A man pushes a wall and fails to displace it. He does

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Negative work

Positive work but not maximum work

No work at all

Maximum positive work

The escape velocity of a body depends upon

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The mass of the body

The mass of the planet

Volume of body

Density of body

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