Question # 1

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

If the slope of the velocity-time graph increases at constant rate with time, then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

The angle of deflection of coil can be measured by the

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one method

three method

two method

none of these

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

The displacement coincides with the path of the motion when a body moves is a

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curved line

straight line

may be curved or straight

none of them

On colliding in a closed container, the gas molecules

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Transfer momentum to the walls

Momentum becomes zero

Move in opposite directions

Perform Brownian motion

Practically the quantity v/c is always:

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less than one

Equal to one

Greater then one

all of these

None of these

From sand, we get a material used for construction with the motion of bodies under the action of forces is called:

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Optics

Mechanics

Thermodynamics

Astrophysics

We cannot utilize the heat contents of oceans and atmosphere because

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there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

A relationship between Gauses of magnetic induction and Tesla(T) is given by

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G 10^-3T

G = 10^-2T

G = 10^-4T

G = 10^-1T

The pressure energy per unit volume of a liquid is

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The escape velocity for the surface of moon is

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9.8 km/sec

11 km/sec

2.4 km/sec

2.9 km/sec

What will be the ratio of the distance moved by a freely falling body from rest in 4^th and 5^th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

The magnitude of the scalar product can also written as

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Magnitude of vector and effective component of vector

Vector and effective component of vector

Vector and perpendicular component of vice vector

None of these

A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:

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20min

60min

80min

90min

A 50 kg man is falling freely force acting on it will be

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5 N

50 N

500 N

zero

When the density is constant for the steady flow of incompressible fluid equation of continuity becomes

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ρ₁A₁V₁ = ρ₂A₂V₂

ρ₁m₁A₁V₁ = ρ₁m₁A₂V₂

A₁V₁ = A₂V₂

None of these

At points where the crest (or trough) of one wave coincides with the crest (or trough) of the other wave, the wave produces

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destructive interference

constructive interference

diffraction

dispersion

A particle of mass 'm' at rest is acted upon by a force 'P' for a time 't' its kinetic energy after an interval 't' is

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P²t²/m

P²t²/2m

P²t²/3m

Pt/2m

1 kg mass of a substance is equivalent to the mass of

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1.1 x 10³⁰ electrons

11 x 10¹⁹ electrons

1.6 x 10³¹ electrons

9.1 x 10¹⁹ electrons

Which one of the following gas properties of gas molecules is the same at a particular temperature

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Momentum

Speed

Mass

Kinetic Energy

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