61: Which one of the following pairs is correctly matched ?
(a) Bhaskaracharya : Ashtanga Sangraha
(b) Bhatti : Sisupala Vadha
(c) Hemachandra : Kathasaritsagara
(d) Sri Harsha : Naishadha Charita
62: Economic Survey in India is published officially, every year by the
(a) Reserve Bank of India
(b) Planning Commission of India
(c) Ministry of Finance, Government of India
(d) Ministry of Industries, Government of India
63: With reference to 'fuel cells' in which hydrogen-rich fuel and oxygen are used to generate electricity. Consider the following statements :
1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
2. Fuel cells can be used for powering buildings and not for small devices like laptop computers.
3. Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is / are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
64: Permanent hardness of water cannot be removed by:
(a) Boiling
(b) Adding caustic soda
(c) Distillation
(d) Adding soda
65: The stones formed in human kidney consist mostly of
(a) calcium oxalate
(b) sodium acetate
(c) magnesium sulphate
(d) calcium