All Free Everyday Science MCQs with Answers

921. Which of the following is not an enzyme?

• A. Chemotrypsin
• B. Secretin
• C. Pepsin
• D. none

Explanation: Secretin is a digestive hormone released by the small intestine, not an enzyme. Chymotrypsin and pepsin are protein-digesting enzymes.

922. It is impossible for a type of O+ baby to have a type of____________mother:

• A. AB-
• B. O-
• C. O+
• D. none

Explanation: An O blood-group child must inherit an O allele from each parent, but an AB mother has only A and B alleles. The mother's Rh-negative status does not prevent an Rh-positive child, so AB- is the impossible option.

923. An area of microbiology that is concerned with the occurence of disease in human population is?

• A. Immunology
• B. Paracitology
• C. Epidemiology
• D. none

Explanation: Epidemiology studies the distribution, causes and control of diseases in human populations. Immunology concerns immune responses, while parasitology concerns parasites.

924. Anti Diuretic hormone is secreted by one of the following glands?

• A. Pituitary
• B. Pancreas
• C. Thyroid
• D. None

Explanation: ADH is made in the hypothalamus but stored and released by the posterior pituitary, so standard MCQs credit the pituitary gland. It helps the kidneys conserve water.

925. One of the following is a water soluble vitamin?

• A. Vitamin A
• B. Vitamin D
• C. Vitamin K
• D. None

Explanation: Vitamins B and C are water-soluble, whereas vitamins A, D, E and K are fat-soluble. Since none of the listed options is B or C, the answer is 'None'.

926. The dominant phase of life cycle in these organism is haploid?

• A. Mosses
• B. Bacteria
• C. Protozoa
• D. None

Explanation: In mosses, the conspicuous and nutritionally independent plant is the haploid gametophyte, while the diploid sporophyte remains attached to it. This is why mosses are contrasted with plants having a dominant diploid phase.

927. The biggest species of the cat family is___________?

• A. Tiger
• B. Lion
• C. Leopard
• D. None

Explanation: The tiger is the largest living member of the cat family, although individual lions can sometimes be very large. Leopards are considerably smaller than both.

928. The field of specialization of famous Muslim scientist Abu Usman Aljahiz was?

• A. Botany
• B. Zoology
• C. Astronomy
• D. None

Explanation: Abu Usman Al-Jahiz is remembered for zoological writing, especially his work on animals and their behaviour. He was not primarily an astronomer or botanist.

929. What is the average adult pulse rate?

• A. 140-150
• B. 115-125
• C. 72-80
• D. 60

Explanation: A normal resting adult pulse is commonly about 60 to 100 beats per minute, with 72 to 80 often used as the average range. Exercise, stress, illness and fitness can change the rate.

930. When a person enters a dark room from bright light he is not able to see clearly for a little while because the?

• A. Eye is unable to adjust itself immediately
• B. Retina becomes insensitive momentarily
• C. Iris is unable to dilate the pupil immediately
• D. Distance between the lens and retina take time to adjust

Explanation: In bright light, the iris keeps the pupil constricted; entering darkness requires time for the pupil to dilate and for the retina to adapt. Thus the immediate problem is delayed adjustment of the iris and pupil.