1 In which of the following conditions, the distance between the molecules of hydrogen gas would increase?  (i) Increasing pressure on hydrogen contained in a closed container (ii) Some hydrogen gas leaking out of the container(iii) Increasing the volume of the container of hydrogen gas (iv) Adding more hydrogen gas to the container without increasing the volume of the container (a) (i) and (iii) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (ivQ. 2 On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be: a) 33°C, 56°C and 118°C (b) 35°C, 56°C and 119°C (c) 35°C, 56°C and 118°C (d) 56°, 119°C and 35° CQ. 3 Which of the following phenomena always results in the cooling effect?(a) Condensation(b) Evaporation(c) Sublimation(d) None of theseQ. 4 A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s2. Find how far the car will go before it is brought to rest?a) 8100 m                                          (b) 900 m(c) 625 m                                 (d) 620 mQ.5 What is the name of the metal which exists in liquid state at room temperature?a) Sodium(b) Potassium(c) Mercury(d) BromineQ.6. The continuous zig-zag movement of colloidal particles in a dispersion medium is called.(a) Dispersion(b) Tyndall effect(c) Brownian movement(d) OscillationQ .7 Two objects of different masses falling freely near the surface of moon would:a) Have different accelerations   (b) Undergo a change in their inertia(c) Have same velocities at any instant          (d) Experience forces of same magnitudeQ. 8 Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will bea) 1/4 times                 (b) 4 times(c) 1/2 times                        (d) UnchangedQ. 9 Newton’s third law of motion explains the two forces namely ‘action’ and ‘reaction’ coming into action when the two bodies are in contact with each other. These two forces:(a) Always act on the same body(b) Always act on the different bodies in opposite directions(c) Have same magnitude and direction(d) Acts on either body at normal to each otherQ 10 . The earth and the moon are attracted to each other by gravitational force. The earth attracts the moon with a force that is:(a) More than that exerted by the moon        (b) Same as that exerted by the moon(c) Less than that exerted by the moon   (d) Not related to that exerted by the moonQ. 11 Identify solute and solvent in ‘tincture of iodine’.Your answerQ. 12 Why is water called universal solvent?Your answerQ. 13 Identify the elements from the following substances: sulphur, brine, hydrochloric acid, water, neon, paper, sugar.Your answerQ. 14 Give two ways in which melting points and boiling points can be useful.Your answerQ. 15 Why do the gases exert more pressure on the walls of the container than the solids?Your answerQ. 16 In which of the following, the particles have highest forces of attraction?Water, NaCl (solid), ice or, wax.Your answerQ. 17 Suppose gravity of earth suddenly becomes zero, then which direction will the moon begin to move if no other celestial body affects it?Your answerQ. 18 Mention any four phenomena that the universal law of gravitation was able to explain.Your answerQ. 19 Why is ‘G’ called the universal gravitational constant?Your answerQ. 20 Define 1 newton force.Your answerQ. 21 Name the principle on which a rocket works.​