Q61. Why does the boiling point of water decrease with height?
(A) Due to high atmospheric pressure
(B) Due to high temperature
(C) Due to low atmospheric pressure
(D) Due to low temperature
(C) Due to low atmospheric pressure
Q62. Yellow colour of urine is due to the presence of?
(A) Cholesterol
(B) Lymph
(C) Bile
(D) Eurochrome
(D) Eurochrome
Q63. Which cells of the human body have the least regeneration power?
(A) Muscle cells
(B) Brain cells
(C) Liver cells
(D) Bone cells
(B) Brain cells
Q64. Radioactive substances are emitted by-
(A) Alpha ray
(B) Beta rays
(C) Gamma rays
(D) All of the above
(D) All of the above
Q65. Which of the following is commonly used for decolorization of pulp in paper industry?
(A) Hydrogen peroxide
(B) Iodine and water
(C) Mild sulphuric acid
(D) Glucose isomerase
(A) Hydrogen peroxide
Q66. In nuclear reactors, energy is produced from-
(A) By controlled fusion
(B) By uncontrolled fusion
(C) Controlled fission
(D) Uncontrolled fission
(C) Controlled fission
Q67. The universe is expanding. Who first gave this proof?
(A) Newton
(B) Edwin Humble
(C) Galileo
(D) Copernicus
(B) Edwin Humble
Q68. Which of the following does not contain carbon?
(A) Diamond
(B) Graphite
(C) Coal
(D) None of these
(D) None of these
Q69. As a person grows older, his blood pressure usually decreases.
(A) Decreases
(B) Keeps changing
(C) Remains the same
(D) Increases
(A) Decreases
Q70. The nearest star to the Sun is-
(A) Beta Centauri
(B) Proxima Centauri
(C) Alpha Centauri
(D) Gamma Centauri
(B) Proxima Centauri