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Robert Koch worked on--

1. A Cholera
2. B Diabetes
3. C Malaria
4. D Tuberculosis

Which of the following sulphur compound is used as a bleaching agent in textile industry?

1. A carbon disulphide
2. B hydrogen sulphide
3. C sulphur dioxide
4. D sulphuric acid

By what name is water which contains soluble salts of calcium and magnesium known?

1. A hard water
2. B heavy water
3. C mineral water
4. D soft water

Quinine is obtained from the bark of which tree?

1. A Bunyan
2. B Cinchona
3. C Eucalyptus
4. D Redwood

Which gas is present under pressure in soft drinks?

1. A Carbon Di-oxide
2. B Nitrogen
3. C Nitrous oxide
4. D Oxygen

Dry sand appears bright while wet sand appears dark because of--

1. A diffraction
2. B optical illusion
3. C reflection
4. D refraction

Myopia is connected with--

1. A ears
2. B eyes
3. C legs
4. D lungs

The blood group which is univershal recipient is--

1. A A-
2. B AB+
3. C B-
4. D O+

Which of the following is not a gas?

1. A Helium
2. B Mercury
3. C Nitrogen
4. D Oxygen

Hepatitis C increases the risk of--

1. A Blood Cancer
2. B HIV AIDS
3. C Liver Cancer
4. D Stomach Cancer

Who among the the following is associated with the invention of computers?

1. A Babbage
2. B Edison
3. C Mac Millen
4. D Rangabhashyam

What is the difference between Bangladesh Standard Time and Greenwich Mean Time?

1. A 10 hours
2. B 5 hours
3. C 6 hours
4. D 8 hours