Daily practice questions
dated :4/10/2017
1, A car is moving along a straight road with a uniform acceleration. It passes through two points P and Q separated by a distance with velocity 30 km/hr and 40 km/hr respectively. The velocity of the car midway between P and Q is (A) 33.3 km/hr (B) 20 3 km/hr (C) 25 2 km/hr (D) 35 km/hr
2 , A body is released from a great height and falls freely towards the earth. Exactly one second later another body is released. What is the distance between the two bodies 2 sec after the release of the second body. (A) 4.9 m (B) 9.8 m (C) 24.5 m (D) 50 m 3,
An object is cooled from 85 to 75◦C in 2 min in a room at 30◦C. What time will be taken for the object to cool from 55 to 45 ◦C. 4,
5,
6,
7,
8
9,
10, The screening effect of d - electrons is (A) equal to the p – electrons (B) much more than p - electron as f – electrons (D) less than p - electrons
Answers 1, c 2,c 3, change length =1.7x10 power -4 m 4,
(C) same
5,
6,
7,
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10, d