521. Due to a lack of which of the following Vitamins, there happens night blindness?
(A) Vitamin B
B) Vitamin A
(C) Vitamin D
(D) Vitamin K
522. Rickets is a disease that is mostly found in?
(A) Old age people
(B) Women
(C) Young people
D) Children
523. Rickets is the disease of the?
(A) Teeth
B) Bones
(C) Skin
(D) Brain
524. As the temperature rises, the speed of sound:
(A) decreases
(B) remains constant
(C) becomes variable
D) rises
525. Which of the following has the largest wavelength?
(A) X-rays
(B) Infrared light
C) Visible light
(D) Gamma rays
526. The density of water is:
(A) 400 kg/m3
(B) 600 kg/m3
(C) 800 kg/m3
D) 1000 kg/m3
527. Cholera vaccine was prepared by:
(A) Eders
B) Louis Pasteur
(C) James Black
(D) Linda Buck
528. What is the life span of Red Blood Cells?
(A) 100 days
(B) 110 days
C) 120 days
(D) 130 days
529. Dr. Abdus Salam of Pakistan was one of the contributors to the unification of:
(A) Electromagnetic force and weak nuclear force
(B) Electromagnetic force and gravitational force
(C) Gravitational force and weak nuclear force
D) Weak nuclear force and strong nuclear force
530. If the length of a heater coil is reduced by 10% of its original length, then Power consumed by the heater will:
A) Decrease by 10%
B) Increase over 10%
C) Decrease by 0.5%
D) Increase by 0.5%
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