Q1. Which of the following is the new strain of bacteria produced by biotechnology in alcohol industry?
(a) Escherichia coli
(b) Pseudomonas putida
(c) Bacillus subtilis
(d) Saccharomyces cerevisiae
Q2. In automatic wrist watches energy is provided by which of the following?
(b) manual binding
(c) different movements of our hand
(d) liquid crystal
Q3. Sodium stearate is a salt and is used—
(a) to make Soap
(b) in Paint
(c) in gunpowder
(d) to make fertilizer
Q4. Consider the following statements:
1. Human beings have 23 pairs of chromosomes.
2. Sex chromosome in human male is named XX.
3. Chromosomes are best seen in metaphase.
Which of the statements given above are false about chromosomes?
(a) 1 and 2
(b) 2 only
(c) 1, 2 and 3
(d) None of these
Q5. What does the airbag contain, which is used for safety of car driver?
(a) Sodium bicarbonate
(b) Sodium nitrite
(c) Sodium azide
(d) Sodium peroxide
Q6. The weight of any body is—
(a) maximum at poles
(b) same at every place on earth’s surface
(c) more on equator
(d) more on mountains than in planes
Q7. Which of the following pairs is/are correctly matched?
1. Isotopes : Atoms with same atomic number but different atomic mass.
2. Isobars : Atoms with same number of neutrons but different atomic number.
3. Isotones : Atoms with same mass number but different atomic number.
Select the correct answer using the codes given below :
(a) 1, 2 and 3
(b) 1 and 2 only
(c) 1 only
(d) 2 only
Q8. Which of the following properties is not possible in case of X-rays?
(d) All of the above
Q9. Why the leaning tower of Pisa does not fall?
(a) it is tappered at the top.
(b) it covers a large base area.
(c) its centre of gravity remains at the lowest position.
(d) the vertical line through the centre of gravity of the tower falls within the base.
Q10. Sound travels in the form of which waves?
(a) transverse waves
(b) longitudinal waves
(c) stationary waves
(d) none of the above
Q11. Which of the following is used as a preservative to protect processed food?
(a) Sodium sulphate
(b) Sodium metabisulphite
Q12. Which one is correct about “The force binding the nucleons inside the nucleus is”?
(a) charge independent
(b) strong and highly repulsive
(c) a central force
(d) charge dependent
Q13. What is a mixture of potassium nitrate, powdered charcoal and sulphur called?
(c) Gun powder
Q14. Retina of the eye is comparable to which of the following parts of a traditional camera?
Q15. A man is standing on a boat in still water. If he walks towards the shore, the boat will
(a) move towards the shore
(c) remain stationary
(d) move away from the shore