MEDIUM
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Which international agreement aims to reduce greenhouse gas emissions?

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Important Questions on Chemical Bonding and Molecular Structure

EASY
A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to 8×10-4 J by the end of the second revolution after the beginning of the motion?
MEDIUM
The moment of inertia of a ring about an axis passing through the centre and perpendicular to its plane is I. It is rotating with angular velocity ω. Another identical ring is gently placed on it so that their centres coincide. If both the rings are rotating about the same axis then loss in kinetic energy is
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:

EASY
A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm s-1. How much work is needed to stop it?
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 spherical black bodies have radii r1 and r 2. Their surface temperatures are T1 and T 2. If they radiate same power then r2r1 is
MEDIUM

3CO2+9 ATP+6 NADPH+Waterglyceraldehyde3-phosphate+9 ADP+6 NADP++8Pi

Where in the chloroplast does this process occur?

MEDIUM
Draw a well-labeled diagram showing the ultra-structure of the chloroplast.
EASY
Photosynthetic pigments in chloroplast are embedded in membrane of
HARD
Refer to the given diagrammatic representation of an electron micrograph of a section of chloroplast and answer the question.
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Select the option which correctly depicts the functions of parts X, Y and Z .
MEDIUM

Examine the figure

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Name the metabolic processes taking place in the places marked 1 and 2.