Q.21 In an examination, there were 2000 candidates, out of whom 900 candidates were boys and rest were girls. If 32% of the boys and 38% of the girls passed, then the total percentage of failed candidates is-

Ans. 64.7%

Q.22 Ram spends 30% of his salary on house rent, 30% of the rest he spends on his children's education and 24% of the rest salary he spends on clothes. After his expenditure, he is left with Rs. 2500. What is Ram's salary?

Ans. 10,000 (According to key 6713.2)

Q.23 If 'n' is a nutural number, then (6n2+6n) is always divisible by-

Ans. Both 6 and 12

Q.24 Find the greatest number that will divide 43, 91 and 183 so as to leave the same reminder in each case-

Ans. 4

Q.25 Find the area of an isosceles right-angled triangle whose hypotenuse is 8 cm.

Ans. 16 m2

Q.26 The ratio between the speed of two trains is 7:8, if the second train rums 400 km in 4 hours, then the speed of the first train is-

Ans. 87.5 km

Q.27 Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed ?

Ans. 25200

Q.28 3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

Ans. 12

Q.29 A father said to his son, "I was as old as you are at the present at the time of your birth." If the father's age is 38 years now, the son's age five year back was?

Ans. 14 years.

Q.30 (469 + 174)2 - (469 - 174)2)/(469 x 174) = ?

Ans. 4

Q.31 Souring of milk at room temperature involve-

Ans. chemical change

Q.32 The decomposition of vegetable matter into compost is an example of-

Ans. Exothermic process

Q.33 ZnO is an amphoteric oxide because-

Ans. It reacts with acid and base both

Q.34 LiCl is soluble in organic solvent due to-

Ans. Covalent bonding

Q.35 When HCl is added to copper oxide then-

Ans. Blue compound is formed

Q.36 The nutrition in mucor (Fungus) is-

Ans. Saprophytic

Q.37 Which one of the following is connected with transport of water in plants?

Ans. Xylem

Q.38 Main function of kidney is-

Ans. Selective reabsorption and Ultra filtration

Q.39 Which one is correct about magnification produce by a concave mirror?

Ans. it may be less than or greater than one

Q.40 A white lights falls on a glass prism, the least deviated colour is-

Ans. Red

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