1. Kerosene oil rises up in a wick of a lantern because of (a) diffusion of the oil through the wick (b) surface tension (c) buoyant force of air (d) the gravitational pull of the wick Ans: B
2. Two pieces of metal when immersed in a liquid have equal upthrust on them; then (a) both pieces must have equal weights (b) both pieces must have equal densities (c) both pieces must have equal volumes (d) both are floating to the same depth Ans: C
3. If the force on the surface is doubled and area is reduced to half, pressure will (a) become 2 times (b) become 3 times (c) become 4 times (d) remain unchanged Ans: C
4. Pressure at a point inside a liquid does not depend on (a) the depth of the point below the surface of the liquid (b) the nature of the liquid (c) the acceleration due to gravity at that point (d) the shape of the containing vessel Ans: D
5. The bulk modulus for an incompressible liquid is (a) zero (b) unity (c) infinity (d) between 0 and 1 Ans: C
6. An egg when placed in ordinary water sinks but floats when placed in brine. This is because (a) density of brine is less than that of ordinary water (b) density of brine is equal to that of ordinary water (c) density of brine is greater than that of ordinary water (d) None of these Ans: C
7. Water is flowing through a horizontal pipe in streamline flow. At the narrowest part of the pipe (a) Velocity is maximum and pressure is minimum (b) Pressure is maximum and velocity is minimum (c) Both the pressure and velocity are maximum (d) Both the velocity and pressure are minimum Ans: A
8. The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ? (a) Length = 50 cm , diameter = 0.5 mm (b) Length = 100 cm, diameter = 1 mm (c) Length = 200 cm, diameter = 2 mm (d) Length = 300 cm, diameter = 3 mm Ans: A
9. A man is sitting in a boat which is floating in pond. If the man drinks some water from the pond, the level of water in the pond will (a) rise a little (b) fall a little (c) remain stationary (d) None of these Ans: C
10. In solids, interatomic forces are (a) totally repulsive (b) totally attractive (c) combination of (a) and (b) (d) None of the Ans: C
11. A body floats in a liquid containing in a beaker. The whole system as shown in Fig. is falling under gravity. The upthrust on the body due to liquid is (a) zero (b) equal to weight of body in air (c) equal to weight of liquid displaced (d) equal to weight of immersed part of the body Ans: A
12. A water tank of height 10 m, completely filled with water is placed on a level ground. It has two holes one at 3 m and the other at 7 m from its base. The water ejecting from (a) both the holes will fall at the same spot (b) upper hole will fall farther than that from the lower hole (c) upper hole will fall closer than that from the lower hole (d) more information is required Ans: A
13. The lift of an air plane is based on (a) Torricelli’s theorem (b) bernoulli’s theorem (c) law of gravitation (d) conservation of linear momentum Ans: B
14. The rain drops falling from the sky neither injure us nor make holes on the ground because they move with (a) constant acceleration (b) variable acceleration (c) variable speed (d) constant terminal velocity Ans: B
15. Two soap bubbles are held by a tube. What will happen ? (a) Air will travel from bigger to smaller bubble (b) Air will not travel (c) Air will travel through tube (d) Nothing can be said Ans: A
16. With the increase of temperature, the surface tension of the liquid (a) may increase or decrease depending on the density of liquid (b) remains the same (c) always increases (d) always decreases Ans: D
17. According to Hooke’s law of elasticity, if stress is increased, then the ratio of stress to strain (a) becomes zero (b) remains constant (c) decreases (d) increases Ans: B
18. Liquid pressure at a point in a liquid does not depend on the (a) density of liquid (b) shape of the vessel in which the liquid is kept (c) depth of the point from the surface (d) acceleration due to gravity Ans: B
19. A container partly filled in a liquid is suspended from a spring balance. A small body is gently dropped in the container. The pointer of spring balance will (a) read less (b) oscillate (c) read the same (d) read more Ans: D
20. Small droplets of a liquid are usually more spherical in shape than larger drops of the same liquid because (a) force of surface tension is equal and opposite to the force of gravity (b) force of surface tension predominates the force of gravity (c) force of gravity predominates the force of surface tension (d) force of gravity and force of surface tension act in the same direction and are equal Ans: B
21. Which of the following materials is most elastic ? (a) Rubber (b) Lead (c) Wood (d) Steel Ans: D
22. A stretched rubber has (a) increased kinetic energy (b) increased potential energy (c) decreased kinetic energy (d) decreased potential energy Ans: B
23. The load verses elongation graph for four wires is shown. The thinnest wire is (a) a (b) b (c) c (d) d Ans: B
24. Elastomers are the materials which (a) are not elastic at all (b) have very small elastic range (c) do not obey Hooke’s law (d) None of these Ans: C
25. The lift in an aeroplane is based on (a) Law of gravitation (b) Theorem of continuity (c) Pascal’s low (d) Bernoulli’s theorem Ans: D
26. In the figure below is shown the flow of the liquid through a horizontal pipe. Three tubes A, B, and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cms. It can be said that (a) the height of the liquid in the tube A is maximum (b) height of the liquid in the tube A and tube B is the same (c) height of the liquid in all the three tubes is the same (d) height of the liquid in tube A and C is the sam Ans: D
27. Houses far from the municipal water tank find it difficult to get water on the top floor even if their ceilings are lower than the level of water filled in tank. Its reason is (a) pipes are more wide. (b) pipes are less wide. (c) when water flows there is loss of pressure. (d) None of these Ans: C
28. Working of atomizer is based on (a) Boyle’s law (b) Bernoulli’s law (c) Newton’s laws of motion (d) Archimedes’ principle Ans: B
29. Ideal liquid is that liquid (a) whose density is zero (b) whose viscosity is zero (c) which is compressible (d) None of these Ans: B
30. Water is flowing through a horizontal pipe line having a restriction. Then (a) pressure will be the same throughout the length of the pipe. (b) pressure will be greater at the restriction. (c) pressure will be greater in the wider portion. (d) None of these Ans: C
31 Paint-gun is based on (a) Bernoulli’s theorem (b) Archemedes’ principle (c) Boyle’s law (d) Newton’s laws of motion Ans: A
32. A tank filled with water has a hole at a certain height from its bottom. The volume of water emerging out per second from the hole does not depend on (a) the height of the level of liquid above the hole. (b) the area of a hole. (c) the density of a liquid. (d) the acceleration due to gravity. Ans: C
33. A boy carries a fish in one hand and a bucket of water in the other hand. If he places the fish in the bucket, the weight now carried by him. (a) is less than before (b) is more than before (c) is the same as before (d) depends upon his speed Ans: C
34. A drop of oil is placed on the surface of water. Which of the following statements is correct? (a) It will remain on it as a sphere (b) It will spread as a thin layer (c) It will partly be a spherical droplet and partly a thin film (d) It will float as a distorted drop on the water surface Ans: B
35. For a fluid which is flowing steadily, the level in the vertical tubes is best represented by Ans: A
36. Surface tension of a liquid is due to (a) gravitational force between molecules (b) electrical force between molecules (c) adhesive force between molecules (d) cohesive force between molecules Ans: D
37. A liquid rises in a capillary tube higher than water does. The difference may be due to the fact that (a) diameter of the capillary may be different in the two cases (b) temperature of liquid is higher than that of water (c) surface tension of water is less than that of the liquid (d) both (a) and (c) Ans: C
38. Construction of submarines is based on (a) Archimede's principle (b) Bernoulli's theorem (c) Pascal's law (d) Newton's laws Ans: A
39. The action of a nib split at the top is explained by (a) gravity flow (b) diffusion of fluid (c) capillary action (d) osmosis of liquid Ans: C
40. Why the dam of water reservoir is thick at the bottom? (a) Quantity of water increases with depth (b) Density of water increases with depth (c) Pressure of water increases with depth (d) Temperature of water increases with depth Ans: C
41. Hydraulic lift is based on the principle of (a) Pascal’s law (b) Bernoulli’s theorem (c) Toricelli’s theorem (d) Stoke’s law Ans: A
42. A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is (a) equal to that on A (b) four times that on A (c) two times that on A (d) half that on A Ans: B

1. Air is regarded as a mixture because (a) its pressure may vary (b) its temperature may change (c) its volume changes under different conditions (d) its composition may vary Ans: D
2. Which of the following is a compound? (a) Stainless steel (b) Bronze (c) Graphite (d) Hydrogen sulphide Ans: D
3. The process used to separate oil and water is (a) distillation (b) sublimation (c) separating funnel (d) chromatography Ans: C
4. In which of the following the constituents are present in any ratio? (a) Mixture (b) Compound (c) Solution (d) Colloid Ans: A
5. A mixture of common salt, sulphur, sand and iron filings is shaken with carbon disulphide and filtered through a filter paper. The filtrate is evaporated to dryness in a china dish. What will be left in the dish after evaporation? (a) Sand (b) Sulphur (c) Iron filings (d) Common salt Ans: B
6. Two substances A and B when brought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. The substance C is (a) a compound (b) an element (c) a mixture (d) none of these. Ans: A
7. Camphor can be purified by (a) distillation (b) filtration (c) sedimentation (d) sublimation Ans: D
8. Which one of the following will result in the formation of a mixture? (a) Crushing of a marble tile into small particles (b) Breaking of ice cubes into small pieces (c) Adding sodium metal to water (d) Adding milk to water Ans: D
9. Purity of a solid substance can be checked by its (a) boiling point (b) melting point (c) solubility in water (d) solubility in alcohol Ans: B
10. A mixture of ethanol and water can be separated by (a) filtration (b) decantation (c) fractional distillation (d) sublimation Ans: C
11. Salt can be obtained from sea water by (a) filtration (b) decantation (c) evaporation (d) sublimation Ans: C
12. A sample contains two substances and has uniform properties. The sample is (a) a compound (b) a heterogeneous mixture (c) an element (d) a homogeneous mixture Ans: D
13. Which of the following is considered to be a pure substance? (a) Granite (b) Sodium chloride (c) Muddy water (d) Milk of magnesia Ans: B
14. Physical properties of a mixture (a) vary with the amount of substance. (b) depend on the volume of the substance (c) depend on the organization of the substance (d) vary depending upon its components Ans: D
15. Compounds (a) are the same as mixtures (b) can be separated by their physical properties (c) contain only one type of element (d) are different kinds of atoms chemically combined with each other. Ans: D
16. White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples? (a) They are homogeneous mixtures and be classified as metallic alloys. (b) The materials are heterogeneous mixtures and can be classified by their components (c) The samples have variable compositions and are classified as metallic solutions. (d) The samples are heterogeneous mixtures that can be separated using magnetic properties. Ans: A
17. Which of the following is an example of a heterogeneous substance? (a) Bottled water (b) Table salt (c) Pieces of copper (d) Candle Ans: D
18. Which of the following is an example of a homogeneous substance? (a) Granite (b) Copper sulphate (c) Oil-water solution (d) Muddy water Ans: B
19. Filtration can be used to separate (a) solids from solids (b) liquids from solids (c) liquids from liquids (d) liquids from gases Ans: D
20. Melting points can separate materials because (a) substances melt at different temperatures (b) molecules vibrate rapidly when heated (c) heat causes molecules to disintegrate (d) many substances fuse at the melting point Ans: A
21. Distillation is a good separation technique for (a) solids (b) liquids (c) solid alloys (d) gases Ans: B
22. Solubility is a good separation technique for (a) pure metals (b) noble gases (c) different salts (d) metallic alloys Ans: C
23. Magnetism is most beneficial for separating (a) gases and non-metallic liquids (b) magnetic solids and solids such as sulfur (c) non-metallic solids and solids such as sulfur (d) non-magnetic solids from non-magnetic liquids Ans: B
24. Select the one that is a chemical change. (a) Melting of wax (b) Freezing of water (c) Cooking of food (d) None of these Ans: C
25. Select the one that is a physical change. (a) Digestion of food (b) Growth of plant (c) Rusting of iron (d) None of these Ans: D
26. On passing through a colloidal solution, the beam of light gets .. (a) reflected (b) refracted (c) scattered (d) absorbed Ans: C
27. The size of colloidal particles usually lies in the range (a) [latex]10^{–5}[/latex] [latex]- 10^–7[/latex]cm (b) [latex]10^–7[/latex] [latex]- 10^–9[/latex]cm (c) [latex]10^–3[/latex] [latex]- 10^–5[/latex]cm (d) [latex]10^–2[/latex] [latex]- 10^–6[/latex]cm Ans: A
28. Brass is an example of (a) compound (b) element (c) homogeneous mixture (d) heterogeneous mixture Ans: C
29. Select the one that is not a chemical change ? (a) Dissolution of ammonia in water. (b) Dissolution of carbon dioxide in water. (c) Dissolution of oxygen in water. (d) None of these is a chemical change. Ans: C
30. A change is said to be a chemical change when (a) it is accompanied by energy change (b) it is accompanied by formation of new substances (c) it is accompanied by change in physical properties (d) All the above are correct Ans: D
31. Solutions with low concentrations of solutes are (a) concentrated (b) dilute (c) solvents (d) None of these Ans: B
32. Which of the following statements is true about a colloidal system? (a) It carries a net electric charge (b) It consists of one phase only (c) It can be made out of two gases (d) It is electrically neutral as a whole Ans: D
33. Cloud or fog is an example of colloidal system of (a) liquid dispersed in gas (b) gas dispersed in gas (c) solid dispersed in gas (d) solid dispersed in liquid Ans: A
34. Normal solution is : (a) inert solution (b) acidic solution (c) one litre containing one equivalent (d) basic solution Ans: C
35. Which of the following is a colloid ? (a) Sugar solution (b) Urea solution (c) Silicic acid (d) NaCl solution Ans: C
36. When dispersed phase is liquid and dispersion medium is gas then the colloidal system is called (a) smoke (b) clouds (c) jellies (d) emulsions Ans: B