Science Heat And Modern Physics And Fuel

Omtex – classes “THE HOME OF TEXT”

NAME OF THE STUDENT ROLL NO SUBJECT

TOTAL MARKS 100 TIME 2 HRS. SCIENCE

I. Fill in the blanks (10 marks) 1. Cathode rays are used to produce . 2. A β – particles is a charged particles. 3. α – particles have a velocity ranging from to of that of light. 4. The density of water is maximum at . 5. The CGS unit of specific heat capacity is 6. is formed by the microorganisms living under the sea. 7. is controlled with the help of cadmium or boron steel rods. 8. is present is sedimentary type of rocks. 9. Generally fuels contain . 10. Natural gas contains percent of methane gas. II. True of false (10 marks) 1. The density of water is maximum at 00 C. 2. Hope’s apparatus can be used to demonstrate anomalous behaviour of water. 3. β – particles are positively charged particles 4. X rays are deflected by a magnetic field. 5. The penetrating power of gamma rays is much less than that of alpha rays. 6. Coke produces less heat than coal 7. Natural gas contains 80 – 90 % methane. 8. Natural gas mainly contains methane. 9. Mineral oil is an example of fossil fuels. 10. The small algae present under the sea forms petroleum. III. Define the following any 10 (20 marks) 1. Relative Humidity 2. Kilocalorie 3. Specific heat capacity 4. Unit of specific heat capacity 5. Absolute humidity. 6. Dew Point7. Radioactivity. 8. Radioactive substance 9. Controlled chain reaction 10. Un – controlled chain reaction 11. Nuclear wastes. IV. IV. Describe an experiment to show that the radiations emitted by a radioactive substance are of three types. Diagram is necessary. (4 marks) V. In cold countries during winter even though the lakes are frozen, fish and other aquatic animals and plants can survive in it. (4 marks) VI. What is ‘Anomalous behaviour of water’?

(4 marks)

VII. Explain principle of heat exchange. VIII. State Five properties of α – Particles β – Particles γ – Particles

(9 marks)

IX. State the properties of cathode rays

(4 marks) 1

OMTEX – CLASSES “The home of text”

OMTEX – CLASSES “The home of text”

Omtex – classes “THE HOME OF TEXT”

NAME OF THE STUDENT ROLL NO SUBJECT

TOTAL MARKS 100 TIME 2 HRS. SCIENCE

X. State the properties of X- rays

(4 marks)

XI. Give reason Any 6 (18 marks) 1. While using X – rays for curing skin diseases or other diseases, long exposure to X – rays should be avoided. 2. X – rays are invisible. 3. Boron steel or cadmium rods are used to control chain reaction. 4. Water gas is called blue gas 5. Coal is fossil fuel. 6. Gaseous fuels are superior to the solid and liquid fuels. 7. In the manufacture of ammonia producer gas is used. 8. Petroleum is a fossil fuel. XII. Conservation of fuels is essential.

( 4 marks)

XII. Distinguish between ( 9 marks) 1. Controlled chain reaction and Uncontrolled chain reaction 2. β – particles and Cathode rays 3. Solid fuels Gaseous fuels.

2 OMTEX – CLASSES “The home of text”

OMTEX – CLASSES “The home of text”