MEDIUM
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In the Southern Hemisphere, which direction does the Coriolis force deflect the wind?

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Important Questions on Mechanical Properties of Fluids

EASY

If the kinetic energy of a particle of mass m, performing uniform circular motion in a circle of radius r, is E, find the acceleration of the particle.

EASY

Two particles A, B are moving on two concentric circles of radii R1 and R2 with equal angular speed ω. At t=0, their positions and direction of motion are shown in the figure:

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The relative velocity VA-VB at t=π2ω is given by:

HARD
A particle of mass 20 g is released with an initial velocity 5 m s-1 along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. When the particle reaches point B, its angular momentum about O will be: (Take g=10 m s-2)

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MEDIUM
It is hotter at the same distance over the top of a fire than it is on the side of it, mainly because :
MEDIUM
A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m2 and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is
EASY
In a place near the sea, a breeze blows from the sea to the land in the day time but it blows in the opposite direction at night. Why?
EASY

Assertion: It is hotter over the top of fire than at the same distance on the sides.

Reason: Air surrounding the fire conducts more heat upwards.

EASY
An ordinary electric fan does not cool the air; still, it gives comfort in summer. Explain.
EASY
In which of the following process, convection does not takes place primarily?
EASY
The equatorial and polar regions of the earth receive unequal solar heat. The convection current arising due to this is called:
HARD
Explain the role of rotation of earth in the movement of trade winds.
HARD
In which of the following processes, convection of heat does not take place?
EASY
Two liquids A and B are at 32°C and 24°C. When mixed in equal masses the temperature of the mixture is found to be 28°C . Their specific heats are in the ratio of