1. A ball falls down vertically. Its motion is: (a) periodic (b) linear (c) circular (d) vibratory 2. The correct statement is: (a) Both work and energy have the same units (b) Pot... 1. A ball falls down vertically. Its motion is: (a) periodic (b) linear (c) circular (d) vibratory 2. The correct statement is: (a) Both work and energy have the same units (b) Potential energy of a body is due to its motion (c) Kinetic energy of a body is due to its position or state (d) Kinetic energy can change into potential energy, but potential energy cannot change into kinetic energy. 3. When a bulb lights up on passing current, the change of energy is: (a) from electrical energy to heat energy (b) from electrical energy to light energy (c) from electrical energy to heat and light energy (d) from electrical energy to mechanical energy. 4. The area of an irregular piece of card about 25cm² can be found by using: (a) mm graph paper (b) cm graph paper (c) using mathematical formula (d) measuring all the sides. 5. Some mercury is contained in a test tube; the free surface of Hg is: (a) flat (b) convex (c) concave (d) way. 6. The known quantity used for measuring an unknown quantity by comparison is called: (a) Unit (b) Standard (c) Magnitude (d) symbol. 7. A body weighs 2 kgf at the equator; the weight at the poles will be: (a) same as equator (b) more than 2kgf (c) less than 2 kgf (d) zero. 8. An observer puts his ear on the railway line 500m from a friend with a hammer. When his friend hits the railway line with the hammer, the observer hears two sounds. The sound is first heard through: (a) Railway line. Read more