Haryana Station Supervisor Exam, 2016

31. Magnesium ribbon burns with a dazzling white flame and change into white powder. What is the chemical name of this white powder?

(1) Magnesium sulphate
(2) Magnesium oxide
(3) Magnesium hydroxide
(4) Magnesium chloride

Correct Answer: (1) Magnesium sulphate

Solution:Magnesium ribbon burns with a bright white flame and converts to white powder. The chemical name of the white powder is Magnesium sulphate.

32. Oxidation of glucose is

(1) Exothermic Process
(2) Endothermic Process
(3) Both I and II
(4) None of these

Correct Answer: (1) Exothermic Process

Solution:Chemical reaction is called exothermic. In which energy is obtained in the form of heat. Such as: Oxidation of glucose.

33. Metal which does not react with cold water is -

(1) Potassium
(2) Magnesium
(3) Sodium
(4) Cesium

Correct Answer: (2) Magnesium

Solution:Magnesium metal does not react with cold water.

34. NaCl has higher melting point due to

(1) Hydrogen bond
(2) Vanderwall bond
(3) Static electrical attraction force
(4) Covalent bond

Correct Answer: (3) Static electrical attraction force

Solution:The melting point of NaCl is high due to the static electrical attraction force.

35. Dispersion of light by a prism is due to.

(1) Change in frequency of light
(2) White light is consists of seven colours and all seven colours have different refractive index.
(3) Scattering
(4) None

Correct Answer: (2) White light is consists of seven colours and all seven colours have different refractive index.

Solution:The dispersion of light by a prism is due to white light which is consists of seven colours and all seven colours. have different refractive index.

36. Plants are green in colour because-

(1) They only absorb green light
(2) they reflect green light
(3) They absorb green light
(4) None

Correct Answer: (4) None

Solution:Plants are green because of the presence of chlorophyll and presence of magnesium in chlorophyll.

37. The ultimate cause for the movement of water against the gravity in a tree is-

(1) Osmosis
(2) Transpiration
(3) Absorption
(4) Photosynthesis

Correct Answer: (2) Transpiration

Solution:The ultimate cause for the movement of water against the gravity in a tree is transpiration.

38. Among the following, Urea is transported through

(1) Red blood cells
(2) White blood cells
(3) Plasma
(4) Plaque

Correct Answer: (3) Plasma

Solution:Urea is transported by Plasma.

39. Which one is correct according to the law of reflection of light?

(1) The value of the angle of incidence and the angle of reflection are the same
(2) The value of incidence angle is less than the angles of reflection
(3) The value of the incidence angle is greater than the angles of reflection
(4) None of these

Correct Answer: (1) The value of the angle of incidence and the angle of reflection are the same

Solution:The Value of the angle of incidence and the angle of reflection are the same.

40. Speed of light in vaccum is 3.0x10⁸m/s. The reflective index of liquid is 4/3. Find the speed of light in liquid.

(1) 2.25 x 10⁸m/se
(2) 3 x 10⁸m/se
(3) 4 x 10⁸m/se
(4) 4.33 x 10⁸m/se

Correct Answer: (1) 2.25 x 10⁸m/se

Solution:Speed of light in liquid.

=3 x 10⁸ m/s * 3/4

= 2.25 x 10⁸m/s