Define moment of a couple.

State Newton’s second law.

How does an astronaut float in a space shuttle?

State Snell’s law.

Differentiate convex lens and concave lens.

What is power of accommodation of eye?

Define one calorie.

Distinguish between linear, Arial and superficial expansion.

State Boyle’s law

What happens to the resistance, as the conductor is made thicker?

Why is tungsten metal used in bulbs, but not in fuse wires?

Name any two devices, which are working on the heating effect of the electric current.

What is the audible range of frequency?

What is the minimum distance needed for an echo?

Name three animals, which can hear ultrasonic vibrations.

Write any two elements which are used for inducing radioactivity?

When and where was the first nuclear reactor built?

Give the SI unit of radioactivity

Define: Relative atomic mass.

Define: Atomicity

Give any two examples for heterodiatomic molecules.

A is a reddish brown metal, which combines with O₂ at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B and C with reaction.

A is a silvery white metal. A combines with O₂ to form B at 800^oC, the alloy of A is used in making the aircraft. Find A and B.

What is rust? (or) How is rust formed? Give the equation for formation of rust.

What is mean by binary solution?

Define Volume percentage

The aquatic animals live more in cold region Why?

When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction

Why does the reaction rate of a reaction increase on raising the temperature?

Differentiate reversible and irreversible reactions.

Name the simplest ketone and give its structural formula.

Classify the following compounds based on the pattern of carbon chain and give their structural formula:
(i) Propane
(ii) Benzene
(iii) Cyclobutane
(iv) Furan

How is ethanoic acid prepared from ethanol? Give the chemical equation.

What is collateral vascular bundle?

Where does the carbon that is used in photosynthesis come from?

What is the common step in aerobic and anaerobic pathway?

How does leech respire?

What organs are attached to the two bronchi?

What does CNS stand for?

Why is the colour of the blood red?

Which kind of cells are found in the lymph?

Mention the artery which supplies blood to the heart muscle.

Define stimulus.

Name the parts of the hind brain.

Which acts as a link between the nervous system and endocrine system?

Write the name of a synthetic auxin.

Name the hormones which regulates water and mineral metabolism in man.

Which hormone is secreted during emergency situation in man?

In which part of the flower germination of pollen grains takes place?

What is the enzyme present in acrosome of sperm?

When is World Menstrual Hygiene Day observed?

What is a cross in which inheritance of two pairs of contrasting characters are studied?

A garden pea plant produces axial white flowers. Another of the same species produced terminal violet flowers. Identify the dominant trait.

Name the bond which binds the nucleotides in a DNA.

A human hand, a front leg of a cat, a front flipper of a whale and a bat’s wing look dissimilar and adapted for different functions. What is the name given to these organs?

Which organism is considered to be the fossil bird?

What is the study of fossils called?

Give the name of wheat variety having higher dietary fibre and protein.

Semi-dwarf varieties were introduced in rice. This was made possible by the presence of dwarfing gene in rice. Name this dwarfing gene.

Define genetic engineering.

Mention the diseases caused by tobacco smoke.

What is adult onset diabetes?

How does insulin deficiency occur?

What would happen if the habitat of wild animals is disturbed?

Why fossil fuels are to be conserved?

How are e-wastes generated?

What is Scratch?

Write a short note on editor and its types.

What is Sprite?