463. Gypsum is added to the soil
(a) To decrease the alkalinity
(b) To increase the alkalinity
(c) To decrease the activity
(d) As an insecticide
464. Humidity of the air
(a) Decreases with the increase in the atmospheric temperature
(b) Increases with the increase in the atmospheric temperature
(c) Is not affected by the change in the atmospheric temperature
(d) Does not show any consistent behaviour with the change in atmospheric temperature
465. When a man circles round the earth in a satellite,
(a) His mass remains constant but the weight becomes zero
(b) His mass becomes zero but the weight remains constant
(c) Both the mass and the weight remain constant
(d) Both the mass and the weight become zero
466. The first metal used by the man was
(a) Iron
(b) Aluminium
(c) Copper
(d) Gold
467. Gobar gas contains mainly
(a) Methane
(b) Carbon dioxide
(c) Ethylene
(d) Carbon monoxide
468. Which constitutes the major part of the human body ?
(a) Fats
(b) Plasma
(c) Water
(d) Proteins
469. Dialysis is used for a patient suffering from
(a) Liver trouble
(b) Kidney trouble
(c) Lungs trouble
(d) Bronchitis
470. Pulse reading is done by doctors to find out the
(a) Temperature
(b) Blood pressure
(c) Heart beat
(d) Respiration rate
471. The rash appears on the body after an attack of measles after
(a) Four days
(b) One day
(c) Six days
(d) One week
472. The vitamin responsible for the antisterile activity is
(a) Vitamin A
(b) Vitamin B
(c) Vitamin K
(d) Vitamin E
473. The water in an open pond remains cool even in hot summer because
(a) Of the continuous evaporation of water
(b) Water absorbs heat less rapidly than the atmosphere
(c) Water radiates heat more rapidly than the atmosphere
(d) Water absorbs heat more rapidly than the atmosphere
474. You are travelling in a car and a thunder storm suddenly takes place. What will be your first step ?
(a) Lie flat in the car
(b) Get out of the car and lie flat in the field
(c) Stand below a tree
(d) Go to a nearby wood pole and stick to it