Science Test No. 2

I. Give Scientific Reason. i. In winter the pipeline carrying, water burst in cold countries. ii. A white trails may be seen behind high flying aircraft. iii. A stick dipped in water obliquely appears bent at the surface of water. iv. Radioactive transformation does not take place when an atom emits γ- radiation. v. X – rays are used to detect smuggled of gold or silver. vi. We see the flash of lightening before a thunder is heard.

II. Answer briefly. 1. Many appliances in daily use are based on inter – changeability of different forms of energy explain. 2. Classify the following examples into potential energy and Kinetic energy. 1. A book kept on a table. 2. A compressed spring 3. Running water 4. A rotating top. III. Draw the diagram of the following. 1. Telephone Ear piece.

I.

Give Scientific Reason. 1. α – particles show less deflection as compared to β – particles. 2. Radioactive transformation does not take place when an atom emits γ – rays. 3. X – rays can penetrate through skin but not through bones. 4. X – rays are used to detect fracture of bones. 5. X – rays are used to detect smuggled of gold or silver.

II. Answer briefly. 1. State the types of solution and give one example of each. 2. Causes of Noise pollution. IV. Draw the diagram of the following. 1. Electroplating assembly.