science for 3 grade

Question: The resultant of balanced forces is ________ 1. non zero 2. equal to zero 3. not equal to zero 4. equal to the acceleration produced in the body Answer: ..

Question: If the distance between two bodies is doubled, the force of attraction F between them will be _______ 1. 1/4 F 2. 2 F 3. 1/2 F 4. F A nswer: ..

Question: The state of matter with only one free surface is _______. 1. liquid 2. gas 3. solid 4. plasma Answer: ..

Question: For the equation - S = 10t + 4t 2 what is the acceleration of the body? 1. 8 m/s 2 2. 10 m/s 2 3. 4 m/s 2 4. 8 m/s Answer: ..

Question: An atom has a mass number of 23 and atomic number 11. The number of protons are_________. 1. 11 2. 12 3. 23 4. 44 Answer: ..

Question: Which form of energy does the flowing water possess? 1. gravitational energy 2. potential energy 3. electrical energy 4. kinetic energy Answer: ..

Question: Give four characteristics of a physical change. Answer: 1) A physical change is temporary and is usually reversible. 2) No new substances are formed during a physical change. 3) There is no change in mass of the substance during a physical change. 4) There is no net a..

Question: One of the best solutions to get rid of non-biodegradable wastes is _________________. 1. burning 2. dumping 3. burying 4. recycling Answer: ..

Question: A long-sighted person cannot see objects nearer to his eye than 50 cm. To enable him to read a book 25 cm away, he should use spectacle lenses whose power in dioptres is ____. 1. -6 2. -4 3. -2 4. + 4 Answer: ..

Question: Of these, the most reactive metal is ___________. 1. Fe 2. Zn 3. Al 4. K Answer: ..