A force is applied by direct physical contact between two bodies is

_____ determines speed of light in a medium.

In which process heat is transferred directly from one molecule to other?

Why battery is used in the circuit?

Ultrasound waves compared to audible sound waves have.

Energy generation in stars is due to

The molecule formula P₂O₅ means that:

Arrange the following in the increasing order of the size. Cl^-, Cl, Cl⁺

Example for solid in solid ___________

The product formed when calcium oxide reacts with water is

General molecular formula of alkynes is ___________.

In leeches sperms are stored in

Absorption of water by modern frames of windows in rainy reason is an example of_________

The cytoplasm has granular body called _______

_____ promotes the ripening of fruits.

The pollen is produced in________

L shaped chromosomes are described as_______

Biogenetic law or Recapitulation theory was given by__________

Dr. Norman received the Nobel peace prize in_________

______________ is not related to NIDDM.

Choose the word not applicable to fossil fuels

The device which helps in explaining the concepts easily through pictures is________

What is resultant force?

How do we see distant and closer objects?

Air pressure in car tyre increases during driving explain.

Two metallic wires A and B of same material are connected in parallel. Wire A has length 1 and radius r and wire B has length 2l and radius 2r. Compute the ratio of the total resistance of parallel combination and the resistance of wire A.

Frequency is the most fundamental property of waves. Why?

Write a note on radiation hazards.

In magnesium sulphide, the ratio by mass of Mg and S is 3 : 4. What is the ratio of the number of Mg and S atoms?

What does the term "ion" mean?

Butter is an example of one type of colloidal solution. Name it. Give a reason for your choice.

What is LPG?

What is absolute alcohol?

Draw the ultrastructure of mitochondria and label the parts.

Write the types of granulocytes

When we touch a cactus unknowingly, we get pricked by the thorns. We withdraw our hands immediately. Which type of neuron gets activated first.

Mention the physiological effects of Ethylene.

What happens in the female body (uterus) if the ovum (egg) is not fertilised by a sperm?

Mention the symptoms seen in the case of Down's syndrome.

What is Astrobiology? Explain the criteria.

Define Green Revolution?

Write a note an symptoms of diabetes mellitus.

What is the aim of wild life conservation?

Write a note on 'Visual Communication Device'.

Give examples for Newton's third law.

Write the sign convention for lenses.

With an illustration, explain the method of Calculation for areal expansion of an object.

Kalaivani was watching at a metal pipe, one end of which is connected to a tank at the top of her building and the other end to the tap, which is near the ground level. She was admiring how the water flows from top to the bottom through the pipe. She went and asked her mother, who was an engineer.
(i) Also Kalaivani asked her mother that can she able to compare this with any other scientific concepts?
(ii) How would her mother have compared the resistance in a water pipe as well as in a conductor.
(iii) Give the expression for resistors connected in series and parallel.

(i) How to analyse the planets are irregular shaped?
(ii) What is the method used to find it?
(iii) Planets are sensitive to different frequencies Justify.

Distinguish between Nuclear fission and nuclear fusion.

Give the applications of Avogadro's hypothesis.

Explain Bessemerisation

Explain Solid solution, Liquid solution and Gaseous solution.

Explain the classification based on the direction of the reaction.

How will you classify organic compounds based on the pattern of carbon chain?

Why is a dicot leaf described as dorsiventral?

Describe the heart of rabbit.

List the difference between RBC and WBC.

Tabulate the different parts of the brain and their functions.

Describe the role of pancreas in maintenance of blood sugar level.

Arun and Ram were good friends. But Ram slowly started loosing interest in studies as they grew up. The teacher found out that Ram had three siblings and their parents could not give him good food or personal care. What value does this episode give us.

Mala had a huge scar on her cheek after she met with fire accident during her college days. She is worried if her baby would inherit the scar she had acquired. She clarified with her doctor, she need not worry about it, as her scar is an acquired trait.
(i) What are acquired traits?
(ii) How is it different from inherited traits?

Explain Use and Disuse theory.

A farmer has lot of banana trees in his form. He wishes to go in for selection to improve the crop. Which method can he adopt in banana?

Write a note on Obesity.

What are the solutions suggested for disposal of e-wastes for companies / Organizations?

In a biology period, the teacher drew the heart of rabbit on the board and explained its structure and functions. After the class, your friend told you that he finds it difficult to understand the concept and felt he wanted a detailed explanation.
(i) In what way the teaching can be made easily understandable?
(ii) Do you think using technologies like Visual Communication help students to understand the difficult concepts in a simple way?
(iii) By what means the Visual Communication improve the learning ability?

Force of 50 N acts perpendicular on a body, which is fixed at a point O. The distance of point of action of force from O is 5 cm. Find the moment of force.

The refractive index of kerosene is 1.44. Find the velocity of light through kerosene.

A metal rod 6.522 m long at 285 k expands by 0.576 m at 363 k. Find the coefficient of linear expansion of the metal.

An electric heater works for 30 min at 120 V and takes energy of 1 - 2 kwh. What is the current drawn by the heater?

A boy hears two different sounds when a race car is moving toward and moving away. If the speed of sound in air is 340 ms^-1. The frequency emitted by the car is 800 Hz and the car velocity is 120 ms^-1. Find the frequency heard by the boy? (when the car moving forward).

Plutonium - 239 specimen emits radiation of 4.3 x 10³ GBq per second convert this disintegrations in terms of curie.
(1 Bq = 2.703 x 10^-11curie)

Calculate the gram molecular mass of carbon dioxide (CO₂)