You have three test tubes X, Y and Z half-filled with different solutions, as X is filled with sodium chloride solution, Y is filled with sodium hydroxide solution and Z is filled with dilute hydrochloric acid. On adding one drop of phenolphthalein solution to each of the above solutions, you would observe the solutions in the test tubes as

• X is pink; Y is pink and Z is colourless

• X is colourless; Y is pink and Z is colourless

• X is pale green; Y is colourless and Z is red

• X is colourless; Y is pale green and Z is pink

Match the following

Metals and Non-metals

1. Iodine
2. Mercury
3. Aluminum
4. Chlorine

Their uses

1. Water purification
2. On wounds
3. Thermometers
4. Food packaging

• A : i

  B : ii

  C : iii

  D : iv

• A : iv

  B : ii

  C : iii

  D : i

• A : ii

  B : iii

  C : iv

  D : i

• A : iii

  B : ii

  C : iv

  D : i

83.

Select the true statement from the following.

• Bakelite and melamine are both thermoplastics

• Melamine is a thermoplastic whereas bakelite is a thermosetting plastic

• Bakelite and melamine are both thermosetting plastics

• Bakelite is a thermoplastic whereas melamine is a thermosetting plastic

A few small wax pieces are fixed at nearly equal distances on a flat strip of aluminium. One end of the strip is clamped to a stand and the other end is heated. Consider the following statements A and B.

1. Wax pieces begin to fall one-by-one in the order of their increasing distance from the flame.
2. Aluminium strip transfers heat from the end nearest to the flame to the other end.

Of the two statements given above

• A is observation and Bis inference

• Both A and B are inferences

• B is observation and A is inference

• Both A and B are observations

A bicycle is moving on a straight road at a constant speed. The wheels of the cycle exhibit

• circular and translational motion

• circular, translational and periodic motion

• translational and periodic motion

• circular and periodic motion

Fibers of cotton are obtained from

• the inner fruit wall

• calyx

• seed coat

• fruit wall

Silk is obtained from which stage of silkworm?

• Egg

• Pupa

• Adult

• Larva

Vivipary germinations are found in

• Aquatic plants

• Xerophyte plants

• Mangrove plants

• Shrubs

The momentum of a particle having mass m is p. Its kinetic energy will be

• mp

• p²m

• p² /m

• p² / 2m

Which of the following gives precipitate, with ammoniacal silver nitrate solution?

• C₂H₆ (Ethane)

• C₂H₄ (Ethylene)

• C₂H₂ (Acetylene)

• C₃H₆ (Propene)