1166: Water hyacinth is related to:
(a) Lemna
(b) Pistia
(c) Eichhornia
(d) None of these
1167: Superconductors are so called because they
(a) Efficiently conduct heat from one hot body to another
(b) Offer no resistance to conduction of heat at high temperatures
(c) Offer no resistance to conduction of electricity at low temperatures
(d) Produce high temperatures while conducting electricity
1168: If A = x2 - y2. B = 20 and x + y = 10, then
(a) A is greater than B
(b) B is greater than A
(c) A is equal to B
(d) It is not possible to compare A and B as the data provided is inadequate
1169: Assertion (A) :
An iron ball floats on mercury but gets immersed in water.
Reason (R) :
The specific gravity of iron is more than that of mercury.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
1170: The monthly incomes of Peter and Paul are in the ratio of 4 : 3. Their expenses are in the ratio of 3 : 2. If each saves Rs. 600 at the end of the month, their monthly incomes respectively are (in rupees)
(a) 3200 and 2400
(b) 2800 and 2100
(c) 2400 and 1800
(d) 2000 and 1500