Science Heat And Modern Physics

Omtex – classes “THE HOME OF TEXT”

NAME OF THE STUDENT ROLL NO SUBJECT

TOTAL MARKS 55 TIME 1HR 15MIN. SCIENCE

I. Fill in the blanks (5 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 light. 4. The density of water is maximum at . 5. The CGS unit of specific heat capacity is

of that of

II. True of false (5 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. III. Define the following Any 6. (12 marks) 1. Relative Humidity 2. Kilocalorie 3. Specific heat capacity 4. Unit of specific heat capacity 5. Absolute humidity. 6. Dew Point 7. Radioactivity. 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)

X. State the properties of X- rays

(4 marks)

XI. Give reason Any 2 (4 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.

1 OMTEX – CLASSES “The home of text”

OMTEX – CLASSES “The home of text”