## Newton Laws of Motion Quiz-6

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. A frictionless inclined plane of length l having inclination Î¸ is placed inside a lift which is accelerating downward with an acceleration a(< g). If a block is allowed to move, down the inclined plane, from rest, then the time taken by the block to slide from top of the inclined plane to the bottom of the inclined plane is
•  √(2l/g)
•  √(2l/(g-a))
•  √(2l/(g+a))
•  √(2l/((g-a)sin⁡Î¸ ))
Solution

Q2.Impulse is
•  A scalar
•  Equal to change in the momentum of a body
•  Equal to rate of change of momentum of a body
•  A Force
Solution

Q3.  A body of mass 5 kg starts from the origin an initial velocity u=30i+40jms-1. If a constant force F=-(i+5j )N acts on the body, the time in which the y- component of the velocity becomes zero is
•  5 seconds
•  20 seconds
•  40 seconds
•  80 seconds
Solution

Q4. Consider the following statement: When jumping from some height, you should bend your knees as you come to rest, instead of keeping your legs stiff. Which of the following relations can be useful in explaining the statement
•  ∆(P1 )=-∆(P2)
•  ∆E=-∆(PE+KE)=0
•  F∆t=m∆v
•  ∆x∝∆F
Solution

Q5.The resultant of two forces 3P and 2P is R. If the first force is doubled then the resultant is also doubled. The angle between the two forces is
•  60°
•  120°
•  70°
•  180°
Solution

Q6. A stick of 1 m is moving with velocity of 2.7×108 ms-1. What is the apparent length of the stick
•  10m
•  0.22 m
• 0.44 m
•  2.4 m
Solution

Q7.If two forces of 5 N each are acting along X and Y axes, then the magnitude and direction of resultant is
•  5√2,Ï€/3
•  5√2,Ï€/4
•  -5√2,Ï€/3
•  -5√2,Ï€/4
Solution

Q8.A body of 2 kg has an initial speed 5 ms-1. A force acts on it for some time in the direction of motion. The force time graph is shown in figure. The final speed of the body (g=9.8 m/s2)

•  9.25 ms-1
•  5 ms-1
•  14.25 ms-1
•  4.25 ms-1
Solution

Q9.There is a simple pendulum hanging from the ceiling of a lift. When the lift is stand still, the time period of the pendulum is T. If the resultant acceleration becomes g/4, then the new time period of the pendulum is
•  0.8 T
•  0.25 T
•  2 T
•  4 T
Solution

Q10. The one –rupee coins are put on top of each other on a table. Each coin has a mass m. Which of the following statements is not true
•  The force on the 6th (counted from the bottom) due to all the coins on its top is equal to 4 mg (downwards)
•  The force on the 6th coin due to 7th coin is 4mg (downwards)
•  The reaction of the 6th coin on the 7thcoin is 4 mg (upwards)
• The total force on the 10th coin is 9 mg (downwards)
Solution

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