Question

Q-1A bus starting from a bus stop and moving with uniform acceleration attains a speed 40 kmph in 10 minutes. Find its acceleration. * A. 1/54 meter per second square B. 1/54 kilometer per the second square C. 54 meter per second square D. 54 kilometer per second square Q-2The formula of a molecule is X2 . One molecule of X2 contains 18 protons. If the nucleon number of X is 19,how many neutrons are there in one atom of X ? * 1 point A. 1 B. 9 C. 10 D. 18 Q-3 A ball is gently dropped from a height of 45 m. If its velocity increases uniformly at the rate of 10 meters per second square, with what velocity will it strike the ground? After what time will it strike the ground? * A. v = 30 km/h and t = 3s B. v = 30km/s and t = 30s C. v = 30m/s and t = 3s D. v = 30 m/s and t = 30s Q-4 Give drawbacks of Rutherford's model. * A. i- Unable to explain the source of heat required for movement of electrons. ii- Unable to explain as to why a moving charge does not gain energy and fall into the nucleus. iii- It could not explain about the illusion of radiations of different frequencies by different atoms when heated. iv- It could not explain the stability of an atom when charged electrons are moving under the attractive force of positively charged nucleus. B. i- Unable to explain the source of energy required for movement of protons. ii- Unable to explain as to why a moving charge does not gain energy and rise into the nucleus. iii- It could not explain about the emission of rays of different frequencies by different atoms when heated. iv- It could not explain the stability of an atom when charged electrons are moving under the attractive force of negatively charged nucleus. C. i- Unable to explain the source of energy required for movement of electrons. ii- Unable to explain as to why a moving charge does not lose energy and fall into the nucleus. iii- It could not explain about the emission of radiations of different frequencies by different atoms when heated. iv- It could not explain the stability of an atom when charged electrons are moving under the attractive force of positively charged nucleus. D. i- Unable to explain the source of heat energy required for movement of neutrons. ii- Unable to explain as to why a moving charge does not lose energy and fall into the nucleus. iii- It could not explain about the emission of radiations of different frequencies by different atoms when heated. iv- It could not explain the stability of an atom when charged electrons are moving under the attractive force of positively charged nucleus.

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