What is the main component of bones and teeth?
- (A) Calcium Carbonate
- (B) Calcium Phosphate
- (C) Calcium Sulfate
- (D) Calcium Nitrate
- (B) Calcium Phosphate
An element common to all acids is:
- (A) Hydrogen
- (B) Oxygen
- (C) Sulfur
- (D) Chlorine
- (A) Hydrogen
A red light is used in the traffic signals because:
- (A) It has the longest wavelength and can be easily noticed from a long distance
- (B) It is beautiful of see
- (C) It is visible to people with bad eyesight
- (D) It has the shortest wavelength so easily noticed from a long distance
- (A) It has the longest wavelength and can be easily noticed from a long distance
Which of the following glands secretes tears?
- (A) Lachrymal
- (B) Pituitary
- (C) Thyroid
- (D) Pancreas
- (A) Lachrymal
The largest organ of the human body is:
- (A) Brain
- (B) Liver
- (C) Skin
- (D) Heart
- (C) Skin
Cloudy nights are warmer because:
- (A) Clouds prevent radiations of heat from ground to air
- (B) Of low atmospheric temperature
- (C) Of the compact density of air
- (D) More dust particles gather in the air
- (A) Clouds prevent radiations of heat from ground to air
Enzymes helps in:
- (A) Respiration
- (B) Digestion of food
- (C) Reproduction
- (D) Immune system
- (B) Digestion of food
Which vitamin promotes healthy functioning of eyes in human beings?
- (A) Vitamin B
- (B) Vitamin C
- (C) Vitamin A
- (D) Vitamin D
- (C) Vitamin A
The first metal used by man was:
- (A) Iron
- (B) Copper
- (C) Gold
- (D) Bronze
- (B) Copper
The main function of the kidneys in the body is:
- (A) To control blood pressure
- (B) To control body temperature
- (C) To remove waste products from the body
- (D) To help in digestion of food
- (C) To remove waste products from the body