4521: Consider the following chemicals :
1. Benzene
2. Carbon tetrachloride
3. Sodium Carbonate
4. Trichloroethylene
Which of the above is/are used as dry cleaning chemicals ?
(a) 1 Only
(b) 2 Only
(c) 1, 2 and 4 Only
(d) 1, 2, 3 and 4
4522: A parachutist jumps from a height of 5000 meters. The relationship between his falling speed, 'v' and the distance fallen through 'd' is best represented as
4523: Consider the following statements :
1. The council of Ministers in the Centre shall be collectively responsible to the Parliament.
2. The Union Ministers shall hold the office during the pleasure of the President of India.
3. The Prime Minister shall communicate to the President about the proposals for legislation.
Which of the statements given above is / are correct?
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
4524: Total internal reflection occurs when light travels from:
(a) A rarer medium to a denser medium
(b) A denser medium to a rarer medium
(c) A rarer medium to a denser medium and the angle of incidence is less than the critical angle
(d) A rarer medium to a denser medium and the angle of incidence is greater than the critical angle
4525: Consider the following statements :
Industrial development in India, to an extent, is constrained by
I. lack of adequate entrepreneurship and leadership in business.
II. lack of savings to invest.
III. lack of technology, skills and infrastructure.
IV. limited purchasing power among the larger masses.
Which of the above statements are correct ?
(a) I, II and III
(b) I, III and IV
(c) II, III and IV
(d) I, II and IV