Physical Properties of Matter – Old Year Questions

1. The spherical form of a raindrop is due to –

(a) Density of liquid
(b) Surface tension
(c) Atmospheric pressure
(d) Gravitational force

[Chhattisgarh P.C.S. (Pre) 2003, 39th B.P.S.C. (Pre) 1994, Uttarakhand P.C.S. (Mains) 2002]


2. A drop of water is spherical in shape. This is due to :

(a) Surface tension
(b) Low temperature
(c) Air resistance
(d) Viscosity of water

[Uttarakhand Lower Sub. (Pre) 2010]


3. The raindrops are spherical because –

(a) They fall from a high height
(b) The air has resistance
(c) The water has surface tension
(d) None of the above

[U.P.P.C.S. (Pre) 2005]


4. The tendency of a liquid drop to contract and occupy a minimum area is due to :

(a) Surface tension
(b) Viscosity
(c) Density
(d) Vapour pressure

[I.A.S. (Pre) 1997]


5. Oil spreads on the water surface because –

(a) Oil is denser than water
(b) Oil is less dense than water
(c) The surface tension of oil is more than water
(d) The surface tension of oil is less than water

[U.P.P.S.C. (GIC) 2010, U.P.P.C.S. (Pre) 1994]


6. Kerosene oil floats on water because –

(a) Its density is greater than the density of water.
(b) Its density is less than the density of water.
(c) Its density is equal to that of the density of water.
(d) None of the above

[Uttarakhand Lower Sub. (Pre) 2010]


7. Pressure inside a soap bubble is –

(a) More than atmospheric pressure
(b) Less than atmospheric pressure
(c) Equal to atmospheric pressure
(d) Half of atmospheric pressure

[U.P.P.C.S. (Pre) 2014, U.P.P.C.S. (Pre) 1995]


8. If two bubbles of soap of different diameters come in contact with a tube, then what will happen?

(a) The size of both bubbles will remain the same
(b) The smaller bubble will become smaller and bigger will become bigger
(c) The smaller bubble will become larger and larger will become smaller to get the same size
(d) Both bubbles will burst as soon as they come in contact

[R.A.S./R.T.S.(Pre) 2007]


9. A hydrogen-inflated polyethylene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will –

(a) Decrease in size
(b) Flatten into a disc-like shape
(c) Increase in size
(d) Maintain the same size and shape

[I.A.S. (Pre) 2003]


10. What happens when some charge is placed on a soap bubble?

(a) Its radius increases
(b) Its radius decreases
(c) The bubble collapses
(d) None of the above

[U.P.P.C.S. (Pre) 2019]


11. Four wires of the same material and dimensions as mentioned below are stretched by a load of the same magnitude separately. Which one of them will be elongated maximum?

(a) Wire of 1 m length and 2 mm diameter
(b) Wire of 2 m length and 2 mm diameter
(c) Wire of 3m length and 1.5 mm diameter
(d) Wire of 1m length and 1 mm diameter

[I.A.S. (Pre) 2007]


12. Consider the following statement. If there were no phenomenon of capillarity, then

1. It would be difficult to use a kerosene lamp
2. One would not be able to use a straw to consume a soft drink.
3. The blotting paper would fail to function.
4. The big trees that we see around us would not have grown on the earth.

Which of the following statements given above are correct?

(a) 1, 2, and 3 only
(b) 1, 3, and 4 only
(c) 2 and 4 only
(d) 1, 2, 3 and 4 only

[I.A.S. (Pre) 2012]


13. For which one of the following capillarity is not the only reason?

(a) Blotting of ink
(b) Rising of underground water
(c) Spread of water drop on a cotton cloth
(d) Rising of water from the roots of a plant to its foliage

[I.A.S. (Pre) 1999]


14. Kerosene rising in the wick of the stove is due to

(a) Osmosis
(b) diffusion
(c) Surface tension
(d) biogen contraction

[R.A.S./R.T.S. (Pre) 1997]


15. In a capillary tube a fluid rises more as compared to water, this is due to the:

(a) Fluid is more viscous than that of water
(b) The temperature of fluid is more than that of water
(c) Surface tension of fluid is less than that of water
(d) Surface tension of fluid is more than that of water

[R.A.S./R.T.S.(Pre) 2007]


16. When an air bubble at the bottom of the lake rises to the top, it will–

(a) Increased in size
(b) Decreased in size
(c) Maintain its size
(d) Flatten into a disc-like shape

[I.A.S. (pre) 1996]


17. While traveling by plane, the ink of the pen starts to come out–

(a) Due to a decrease in air pressure
(b) Due to increase in air pressure
(c) Due to increase in volume of ink
(d) Due to excessive load.

[U.P.P.C.S. (Pre) 1992]


18. In automobiles hydraulic brakes work on –

(a) Archimedes Principle
(b) Newton’s law of motion
(c) Bernoulli’s Principle
(d) Pascal’s Law

[Jharkhand P.C.S. (Pre) 2003]


19. A sudden fall in barometer reading indicates that the weather will be :

(a) Stormy weather
(b) Rainy weather
(c) Cool dry weather
(d) Hot and humid weather

[I.A.S. (Pre) 2001, U.P.P.C.S. (Pre) 1996]


20. Consider the figure of a fountain with four holes, given below :

Which one of the holes in the fountain will throw the water farthest?

(a) 4
(b) 3
(c) 2
(d) 1

[I.A.S. (Pre) 1994]


21. A liquid is flowing in a streamlined manner through a cylindrical pipe. Along with a section containing the axis of the pipe, the following profile will be :

[U.P.P.C.S. (Pre) 2003]


22. With the rise of temperature, the viscosity of liquid :

(a) Increases
(b) Decreases
(c) Remains unchanged
(d) May increase or decrease depending on the nature of the liquid

[Uttarakhand P.C.S. (Pre) 2016]


23. The highest viscosity among the following is:

(a) water
(b) air
(c) blood
(d) honey
(e) None of the above / More than one of the above

[66th B.P.S.C. (Pre) 2020]


24. Which one of the following is most viscous?

(a) Alcohol
(b) Water
(c) Honey
(d) Gasoline

[Uttarakhand Lower Sub. (Pre) 2010]


25. Assertion (A): With the increase in temperature, the viscosity of glycerin increases.

Reason (R): The rise of temperature increases the kinetic energy of molecules.

Code :

(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.

[I.A.S. (Pre) 2002]


26. The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. Why?

The following are some options-

(a) Ice is a bad conductor of heat
(b) Since the surface of the lake is at the same temperature as the air, no heat is lost
(c) The density of water is maximum at 4°C
(d) None of the above

[I.A.S. (Pre) 2011]


27. In cold weather, aquatic animals survive even when water at the top layer of the lake freezes into ice because –

(a) They can breathe in ice.
(b) They have enough accumulated oxygen inside them
(c) Their body structure is such that they can survive without oxygen.
(d) Water has the highest density at 4°C so underneath the top layer of ice there is a layer of water.

[U.P.P.C.S. (Pre) 2005]


28. Fish can survive in a frozen lake because –

(a) Fish are warm-blooded animals
(b) Fish hibernate in ice
(c) Water near the bottom does not freeze
(d) Ice is a good conductor of heat

[Jharkhand P.C.S. (Pre) 2010, U.P.P.S.C. (GIC) 2010]


29. Increasing the amount of a substance does not change its–

(a) Volume
(b) Weight
(c) Mass
(d) Density

[U.P.P.C.S. (pre) 1992]


30. The density of water will reach its maximum value at the temperature of –

(a) 0ºC
(b) 4º C
(c) 50º C
(d) 100º C

[R.A.S./R.T.S. (Pre) 1992]


31. At which temperature density of water is maximum?

(a) 4º C
(b) 0º C
(c) –4º C
(d) – 8ºC

[U.P.P.C.S. (Mains) 2008, 43rd B. P.S.C. (Pre) 1999, 42nd B.P.S.C. (Pre) 1998]


32. The maximum density of water is at

(a) 373 Kelvin
(b) 277 Kelvin
(c) 273 Kelvin
(d) 269 Kelvin

[U.P.P.C.S. (Mains) 2015]


33. Assertion (A): An iron ball floats on mercury but gets immersed in water.

Reason (R): The specific gravity of iron is more than that of mercury.
Code :

(a) Both (A) and (R) are true and (R) is the correct explanation of (A)
(b) Both (A) and (R) are true but (R) is not a correct explanation of (A)
(c) (A) is true but (R) is false
(d) (A) is false but (R) is true

[I.A.S. (Pre) 2002]


34. Why does an iron nail float on mercury while it sinks in water?

(a) Due to less chemical interaction of iron with mercury than it is with water
(b) Iron is heavier than water and lighter than mercury.
(c) Iron has greater density than water and less than mercury.
(d) Mercury is heavier than water.

[U.P.P.C.S. (Pre) 1994]


35. A needle sinks in water whereas a ship made of iron floats on it because :

(a) The edge of the needle is pointed
(b) The ship is fat
(c) The ship was driven by a powerful engine
(d) The relative density of the needle is greater than that of water displaced by it

[U.P. Lower Sub. (Spl) (Pre) 2004]


36. An iron needle floats on the surface of water due to –

(a) Upthrust of water
(b) Surface tension
(c) Viscosity
(d) Gravitational force

[U.P.P.C.S. (Mains) 2012]


37. While lifting a bucket of water from a well, we feel that the bucket :

(a) Becomes heavier above the surface of water
(b) Becomes lighter above the surface of the water
(c) Loses stability on coming out of the water
(d) Has gained mass on coming out of water

[U.P.P.C.S. (Pre) 2009]


38. 200 gm of water is filled in a weightless balloon. Its weight in water will be

(a) Zero
(b) 100 gm
(c) 200 gm
(d) 400 gm

[U.P.R.O./A.R.O (Mains) 2014]


39. The clouds float in the atmosphere because of their low :

(a) Temperature
(b) Velocity
(c) Pressure
(d) Density

[I.A.S. (Pre) 1995]


40. While floating in a sea what part of an iceberg is above the surface of the sea?

(a) 1/9
(b) 1/10
(c) 1/6
(d) 1/4

[U.P.P.C.S. (Pre) 2005]


41. An ice cube is floating in a glass of water. What happens to the water level when the ice melts? It –

(a) Rises
(b) Falls
(c) Remains the same
(d) First rises and then falls

[M.P.P.C.S. (Pre) 2008]


42. A body floats at 4°C water. If the temperature reaches 100°C then-

(a) The body will sink
(b) No change
(c) More parts of the body will submerge
(d) The body will float freely

[M.P.P.C.S. (Pre) 1999]


43. Why it is easier to swim in the sea than in a river?

(a) The seawater is salty
(b) The seawater is deep
(c) The seawater is heavier
(d) The sea water is lighter

[U.P. Lower Sub. (Pre) 2002]


44. A body weight is highest in which among the following?

(a) Air
(b) Water
(c) Hydrogen
(d) Nitrogen

[U.P. P.C.S. (Mains) 2017]


45. When a ship enters the sea from a river, what happens?

(a) It rises a little
(b) It remains at the same level
(c) It sinks a little
(d) It is immersed in the bottom of the sea.

[U.P. Lower Sub. (Pre) 2004, U.P. P.C.S. (Pre) 1992]


46. Assertion (A): When a ship enters a sea from a river, it rises a little.Reason (R): The density of seawater is greater than that of river water.

In the context of the above statements, which of the following is true :

(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

[U.P. P.C.S. (Pre) 2003, U.P.U.D.A./L.D.A. (Pre) 2002]