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976. In an atomic nucleus, neutrons and protons are held together by :
A. gravitational forces
B. magnetic forces
C. exchange forces
D. coulombic forces
Explanation:
977. BCG vaccination (Bacillus Calmette Guerine) is injected to get immunity from :
A. polio
B. cholera
C. small pox
D. tuberculosis
Explanation:
978. Which one of the following sets is correctly matched ?
A. Diphtheria, Pneumonia and Leprosy : Hereditary
B. AIDS, Syphilis and Gonorrhoea : Bacterial
C. Colour blindness, Haemophilia and Sickle cell anaemia : Sex linked
D. Polio, Japanese B ancephalitis and Plague : Viral
Explanation:
979. The dark lines in the solar spectrum are due to
A. absorption of corresponding wavelengths by the prism used in the spectrograph.
B. destructive interference between waves of certain definite wavelengths.
C. absorption of corresponding wavelengths by the outer layers of the sun.
D. absence of corresponding wavelengths from the light emitted by teh core of the sun.
Explanation:
980. Which of the following is/are examples of electromagnetic waves ? 1. X-rays 2. Ultrasonics3. Beeta rays 4. Alpha rays
A. 1 only
B. 2 only
C. 1, 3 and 2
D. 2, 3 and 4
Explanation:
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