31.  Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid

a

  increases

b

 decreases

c

 stays the same

d

 none of the above

Answer & Explanation
Answer : Option A

32.  The hardest substance available on earth is

a

  Diamond

b

 Iron

c

 Gold

d

 Platinum

Answer & Explanation
Answer : Option A

33.  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

34.  Rubber is commonly got from

a

  Castilla elastica

b

 Michelia Champaca

c

 Ficus elastica

d

 Hevea brasiliensis

Answer & Explanation
Answer : Option D

35.  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

36.  Detergents used for cleaning clothes and utensils contain?

a

  nitrates

b

 sulphonates

c

 bicarbonates

d

 bismuthates

Answer & Explanation
Answer : Option B

37.  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

38.  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

39.  The freezing point of fresh water is -

a

  0◦C

b

 4◦C

c

 3◦C

d

 5◦C

Answer & Explanation
Answer : Option A

40.  Why do colloidal substance do not deposited below?

a

  Specific gravity is less

b

 They are converted to sovent

c

 They carry electrical charges

d

 It is of very less amount in respect of solvent

Answer & Explanation
Answer : Option A

41.  Rayon is chemically

a

  amylase

b

 pectin

c

 glucose

d

 cellulose

Answer & Explanation
Answer : Option D

42.  The wonder pigment chlorophyll is present in

a

  Mitochondria

b

 Centrosomes

c

 Quantosomes

d

 Lysosomes

Answer & Explanation
Answer : Option C

43.  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

44.  The location and energy of an electron in an atom can be specified by

a

  Quantum numbers

b

 Atomic number

c

 Atomic mass

d

 None of these

Answer & Explanation
Answer : Option A

45.  Rain drops are spherical due to

a

  Viscosity of water

b

 Surface tension

c

 Air friction

d

 Continuous evaporation

Answer & Explanation
Answer : Option B

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