The question below consists of an assertion and a Reason. Use the following key to choose the appropriate answer. A. If both assertion and reason are correct and reason is correct explanation of the assertion B. If both assertion and reason are correct, but the reason is not the correct explanation of the assertion. C. If assertion is correct, but reason is incorrect. D. If assertion is incorrect, but reason is correct.Q.1. Assertion: A potter makes pots of different sizes and shapes from kneaded clay. Reason: Force may bring about change in the size or shape of an object. Q.2. Assertion: When same force is applied for same time, to both car and truck. The car picks up a greater speed than truck in that time. Reason: The magnitude of force needed depends on the mass of object and value of change of speed. Q.3. Assertion: In tug a war, when both the teams pull the rope, with equal and opposite force the rope will remain stationery. Reason: The unequal force may not bring about change in state of rest.Q.4. Assertion: A ball rolling along the ground, gradually slows down and finally comes to rest. Reason: This happens due to force of friction between the ball and the ground. Q.5. Assertion: As we move to higher altitudes, breathing can become difficult. Reason: At higher altitude there is decrease in the atmospheric pressure. Q.6. Assertion: We can drink cold drink from a bottle with help of straw. Reason: The pressure inside the straw is more than the pressure outside.Q.7. Assertion: It is difficult to carry a bag with narrow straps as compared to carry the same bag with broader strap. Reason: When the same force acts over a small area its effect is more. Q.8. Assertion: Falling of rain drops is a contact force. Reason: Gravitational force is an example of contact force. Q.9. Assertion: Pressure = force /area Reason: P =Force /area, here F force is thrust. Q.10. Assertion: Force can be added in pressure. Reason: Force and pressure has same magnitude.
Share
Answer:
Q.1. Assertion: A potter makes pots of different sizes and shapes from kneaded clay.
Reason: Force may bring about change in the size or shape of an object.
Answer: A. If both assertion and reason are correct and reason is a correct explanation of the assertion.
Q.2. Assertion: When the same force is applied for the same time, to both car and truck, the car picks up a greater speed than the truck in that time.
Reason: The magnitude of force needed depends on the mass of the object and value of the change of speed.
Answer: B. If both assertion and reason are correct, but the reason is not the correct explanation of the assertion.
Q.3. Assertion: In tug of war, when both the teams pull the rope, with equal and opposite force, the rope will remain stationary.
Reason: The unequal force may not bring about a change in the state of rest.
Answer: A. If both assertion and reason are correct and reason is a correct explanation of the assertion.
Q.4. Assertion: A ball rolling along the ground gradually slows down and finally comes to rest.
Reason: This happens due to the force of friction between the ball and the ground.
Answer: A. If both assertion and reason are correct and reason is a correct explanation of the assertion.
Q.5. Assertion: As we move to higher altitudes, breathing can become difficult.
Reason: At higher altitudes, there is a decrease in atmospheric pressure.
Answer: A. If both assertion and reason are correct and reason is a correct explanation of the assertion.
Q.6. Assertion: We can drink cold drink from a bottle with the help of a straw.
Reason: The pressure inside the straw is more than the pressure outside.
Answer: A. If both assertion and reason are correct and reason is a correct explanation of the assertion.
Q.7. Assertion: It is difficult to carry a bag with narrow straps as compared to carrying the same bag with broader straps.
Reason: When the same force acts over a small area its effect is more.
Answer: A. If both assertion and reason are correct and reason is a correct explanation of the assertion.
Q.8. Assertion: Falling of raindrops is a contact force.
Reason: Gravitational force is an example of contact force.
Answer: D. If assertion is incorrect, but reason is correct.
Q.9. Assertion: Pressure = force / area
Reason: P = Force / area, here F force is thrust.
Answer: C. If assertion is correct, but reason is incorrect.
Q.10. Assertion: Force can be added in pressure.
Reason: Force and pressure have the same magnitude.
Answer: C. If assertion is correct, but reason is incorrect.
Q.1. A. If both assertion and reason are correct and reason is correct explanation of the assertion. The assertion is a fact and the reason explains how force can change the shape of an object.
Q.2. B. If both assertion and reason are correct, but the reason is not the correct explanation of the assertion. The assertion is true, but the reason does not explain why the car picks up a greater speed than the truck. The correct explanation is that the car has a smaller mass than the truck, and hence, a smaller inertia.
Q.3. C. If assertion is correct, but reason is incorrect. The assertion is true, but the reason is wrong. The correct reason is that the net force acting on the rope is zero, as the forces are balanced.
Q.4. A. If both assertion and reason are correct and reason is correct explanation of the assertion. The assertion is a fact and the reason explains how friction opposes the motion of the ball and reduces its speed.
Q.5. A. If both assertion and reason are correct and reason is correct explanation of the assertion. The assertion is true and the reason explains how the atmospheric pressure decreases with altitude, which reduces the amount of oxygen available for breathing.
Q.6. D. If assertion is incorrect, but reason is correct. The assertion is false, but the reason is true. The correct assertion is that we can drink cold drink from a bottle with help of straw because the pressure inside the straw is less than the pressure outside.
Q.7. A. If both assertion and reason are correct and reason is correct explanation of the assertion. The assertion is true and the reason explains how the pressure exerted by the bag on the shoulder depends on the area of contact.
Q.8. E. Both A and R are false. The assertion is false, as falling of rain drops is a non-contact force. The reason is also false, as gravitational force is an example of non-contact force.
Q.9. B. If both assertion and reason are true but R is not the correct explanation of A. The assertion is the correct formula for pressure, but the reason is not the correct explanation of it. The correct explanation is that pressure is the force acting per unit area.
Q.10. E. Both A and R are false. The assertion is false, as force and pressure are different physical quantities and cannot be added. The reason is also false, as force and pressure do not have the same