Physics-
General
Easy
Question
The figure shows a semi-cylindrical massless gate (of width R) pivoted at the point O holding a stationary liquid of density ρ. A horizontal force F is applied at its lowest position to keep it stationary. The magnitude of the force is:
- zero
The correct answer is: zero
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The position vector 
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Assertion: A massless rope thrown over a frictionless pulley has a ladder with a mass of m on one its ends and a counter balancing mass M on its other end. If a man climbs with some velocity then centre of mass of the system (man, ladder and balancing mass) moving upward.
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A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
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D) If Assertion is false but Reason is true.
Assertion: A massless rope thrown over a frictionless pulley has a ladder with a mass of m on one its ends and a counter balancing mass M on its other end. If a man climbs with some velocity then centre of mass of the system (man, ladder and balancing mass) moving upward.
Reason: Net force on the system is in upward direction is zero.
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.
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Assertion: If the moment of inertia of a non-uniform ring of mass M and radius R is known about an AA', then we can calculate the moment of inertia about BB' (C is the geometrical centre of ring).
Reason: 
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B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.
Assertion: If the moment of inertia of a non-uniform ring of mass M and radius R is known about an AA', then we can calculate the moment of inertia about BB' (C is the geometrical centre of ring).
Reason:
A) If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If Assertion is false but Reason is true.
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A uniform rod of length l is pivoted at point A. It is struck by a horizontal force which delivers an impulse J at a distance x from point A as shown in figure, if impulse delivered by pivot is zero hat initially then x is
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