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Differentiate mass and weight.

Distinguish between balanced and unbalanced force.

Why are traffic signals red in colour?

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

State-the law of volume

What is real gas?

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

The electrical resistivity of few materials is given below in ohm-meter.

Material	Resistivity (in ohm-metre)
A	6.84 x 10-8
B	1.60 x 10-8
C	2.30 x 1017
D	1.00 x 10-6
E	2.50 x 1012
F	4.40 x 10-8

Which of these materials can be used for making element of heating device?

Name three animals, which can hear ultrasonic vibrations.

Why does sound wave travel faster in solids?

Which radioactive material is present in the ore of pitchblende?

Write the conditions necessary for nuclear fusion.

What is Molar volume of a gas?

What is a poly atomic molecule?

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.

Iron when dipped in cone, HNO₃ becomes chemically inert. Give reason.

Give an example each
i) gas in liquid
ii) solid in liquid
iii) solid in solid
iv) gas in gas

i) The solubility of sodium chloride in water increases with rise in temperature while that of lithium carbonate decreases. Assign reason.
ii) Water containing 88-8% oxygen and 11-2% hydrogen is often used as a fire extinguisher. Can a mixture containing the two gases in the same ratio by mass be used for extinguishing fire?
iii) The melting point of a solid when determined experimentally comes out to be 160°C. But its actual melting point as given in standard books is 150°C. Predict the nature of the solid.

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

Powdered calcium carbonate reacts more readily with hydrochloric acid than marble chips. Give reasons.

Name the simplest ketone and give its structural formula.

Write the structural formula of the following compounds.
(i) C₃H₆
(ii) C₄H₆

What is collateral vascular bundle?

Name the tissue systems as classified by Sachs.

Give the common name of the Hirudinaria granulosa

Mention the artery which supplies blood to the heart muscle.

What is the basis for differentiation of blood groups.

Name the parts of the hind brain.

How are neurons classified based on function.

Which hormone promotes the production of male flowers in Cucurbits?

What will happen, if the pancreas of a person stop functioning?

Mention the function of endosperm

Mention the significance of fertilization?

Name the bond which binds the nucleotides in a DNA.

Write a note on euploidy.

What is the study of fossils called?

Explain Chemical evolution of life.

State the importance of biofertiliser.

Differentiate Embryonic and Adult stem cells.

What are psychotropic drugs?

Rajan went to hospital and took an injection for fever. The doctor used a syringe to inject and kept it in his table. What do you think is wrong about this incident.

What will happen if trees are cut down?

List some ill effects of e - wastes.

What is Sprite?

Write a note on 'Visual Communication Device'.