191: Which are the materials generally employed as solder in soldering operation in elections.
(a) Iron and tin
(b) Lead and tin
(c) Aluminum and lead
(d) Aluminum and iron
192: Consider the following statements about Madam Bhikaji Cama :
1. Madam Cama unfurled the National Flag at the international Socialist Conference in Paris in the year 1907.
2. Madam Cama served as private secretary to Dadabhai Naoroji.
3. Madam Cama was born to Parsi parents.
Which of the statements given above is/are correct?
(a) 1 and 2, only
(b) 2 and 3, only
(c) 3 only
(d) 1, 2 and 3
193: One mole of hydrogen gas burns in excess of oxygen to give 290 kJ of heat. What is the amount of heat produced when 4g of hydrogen gas is burnt under the same conditions ?
(a) 145 kJ
(b) 290 kJ
(c) 580 kJ
(d) 1160 kJ
194: In a town 25% families own a phone and 15% own a car. 65% families own neither a phone nor a car. 2000 families own both a car and a phone.
Consider the following statements in this regard:
I. 10% families own both a car and a phone.
II. 35% families own either a car or a phone.
III. 40,000 families live in the town.
Which of the above statements are correct ?
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III
195: Farm land tends to erode most rapidly when planted with
(a) sorghum
(b) potato
(c) wheat
(d) clover