46.  is the longest cell.

a

  Nerve cell

b

 Spleen

c

 Skin

d

 None of the above

Answer & Explanation
Answer : Option A

47.  Paper is manufactured by

a

  Wood, calcium, hydrogen sulphite and resin

b

 Wood and resin

c

 Wood, sodium and bleaching powder

d

 Wood and bleaching powder

Answer & Explanation
Answer : Option A

48.  The hardest substance available on earth is

a

  Diamond

b

 Iron

c

 Gold

d

 Platinum

Answer & Explanation
Answer : Option A

49.  Two strands of DNA are held together by -

a

  covalent bonds

b

 hydrogen bonds

c

 electrostatic force

d

 van der Waals' forces

Answer & Explanation
Answer : Option B

50.  Which of the following are the ingredients of gun metal?

a

  Iron, Brass, Tin

b

 Iron, tin

c

 Copper, Tin

d

 Iron, Zinc, Titanium

Answer & Explanation
Answer : Option C

51.  Earth's seasons are caused by which of the following?

a

  The tilt of the earth's rotation relative to the ecliptic as earth revolves around the sun

b

 The varying amount of sunspot activity

c

 The earth's orbit around the sun as an exlipse rather than a circ

d

 The rotation of during a 24-hour day

Answer & Explanation
Answer : Option A

52.  Detergents used for cleaning clothes and utensils contain?

a

  nitrates

b

 sulphonates

c

 bicarbonates

d

 bismuthates

Answer & Explanation
Answer : Option B

53.  The freezing point of fresh water is -

a

  0◦C

b

 4◦C

c

 3◦C

d

 5◦C

Answer & Explanation
Answer : Option A

54.  Gypsum is added to cement clinker to

a

  increase the tensile strength of cement

b

 decrease the rate of setting of cemen

c

 facilitate the formation of colloidal gel

d

 bind the particles of calcium silicate

Answer & Explanation
Answer : Option B

55.  The dynamo is a device for converting

a

  Heat energy into electrical energy

b

 Mechanical energy into electrical energy

c

 Magnetic energy into electrical energy

d

 None of the above

Answer & Explanation
Answer : Option B

56.  Rubber is commonly got from

a

  Castilla elastica

b

 Michelia Champaca

c

 Ficus elastica

d

 Hevea brasiliensis

Answer & Explanation
Answer : Option D

57.  Among the following animals, choose the one having three pairs of legs.

a

  Bug

b

 Mite

c

 Spider

d

 Scorpion

Answer & Explanation
Answer : Option A

58.  Rayon is chemically

a

  amylase

b

 pectin

c

 glucose

d

 cellulose

Answer & Explanation
Answer : Option D

59.  'Bar' is the unit of

a

  temperature

b

 heat

c

 atmospheric pressure

d

 current

Answer & Explanation
Answer : Option C

60.  Old-written material, which cannot be read easily can be read by

a

  Infra Red rays

b

 Cosmic Rays

c

 Ultraviolet rays

d

 None of these

Answer & Explanation
Answer : Option A

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