## Newton Laws of Motion Quiz-4

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1. An object at rest in space suddenly explodes into three parts of same mass. The momentum of the two parts are 2p i and p j. The momentum of the third part
•  Will have a magnitude p√3
•  Will have a magnitude p√5
•  Will have a magnitude p
•  Will have a magnitude 2p
Solution

Q2.A block of mass 1 kg slides down on a rough inclined plane of inclination 60° starting from its top. If the coefficient of kinetic friction is 0.5 and length of the plane is 1 m, then work done against friction is
•  9.82 J
•  4.94 J
•  2.45 J
•  1.96 J
Solution

Q3.  A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms-1. To give an initial upward acceleration of 20 ms-2, the amount of gas ejected per second to supply the needed thrust will be
•  127.5 kgs-1
•  187.5 kgs-1
•  185.5 kgs-1
•  137.5 kgs-1
Solution

Q4. A rocket of mass 100 kg burns 0.1 kg of fuel per second. If velocity of exhaust gas is 1 kms-1, then it lifts with an acceleration of
•  1000 ms-2
•  100 ms-2
•  10 ms-2
•  1 ms-2
Solution

Q5.A body of weight 50 N placed on a horizontal surface is just moved by a force of 28.2 N. The frictional force and the normal reaction are

•  10 N,15 N
•  20N, 30N
•  2N,3N
•  5N,6N
Solution

Q6. If a street light of mass M is suspended from the end of a uniform rod of length L in different possible patterns as shown in figure, then

•  Pattern A is more sturdy
•  Pattern B is more sturdy
• Pattern C is more sturdy
•  All will have sturdy
Solution

Q7.The pulley and strings shown in figure are smooth and of negligible mass. For the system to remain in equilibrium, the angle Î¸ should be

•
•  30°
•  45°
•  60°
Solution

Q8.A body of 10 kg is acted by a force of 129.4 N if g=9.8 m/s2. The acceleration of the block is 10 m/s2. What is the coefficient of kinetic friction
•  0.03
•  0.01
•  0.30
•  0.25
Solution

Q9.Two masses 8 kg and 12 kg are connected at the two ends of a string that goes over a frictionless pulley. Calculate the acceleration of the masses and the tension in the string.
•  8 m/s2, 144 N
•  4 m/s2, 112 N
•  6 m/s2, 128 N
•  2 m/s2, 96 N
Solution

Q10. A ball of mass 0.5 kg moving with a velocity of 2 m/sec strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force exerted by the wall on the ball is
•  2000 N
•  1000 N
•  5000 N
• 125 N
Solution

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