Physic with Experts

Question: Newton's first law of motion describes the a) inertia b) energy c) work d) moment of inertia Answer: inertia   Question: Inertia is the property of a body linked to tendency of a body a) to resist any change in its state b) to change the momentum c) to change its direction d) to change its position Answer: to resist any change in its state   Question: Physical independence of force is a consequence of a) first law of motion b) third law of motion c) second law of motion d) all of these Answer: first law of motion   Question: A reference frame attached to the earth a) cannot be an inertial frame because earth is revolving round the sun b) is an inertial frame by definition c) is an inertial frame because Newton's laws are applicable d) is an inertial frame because the earth is rotating about its own axis Answer: cannot be an inertial frame because earth is revolving round the sun   Question: The direction of impulse is a) same as that of the net force b) opposite to th

1. A body of mass m, projected at an angle of θ from the ground with an initial velocity of v, acceleration due to gravity is g, what is the maximum horizontal range covered? a) R = v2 (sin 2θ)/g b) R = v2 (sin θ)/2g c) R = v2 (sin 2θ)/2g d) R = v2 (sin θ)/g 2. A body of mass 5 kg, projected at an angle of 60° from the ground with an initial velocity of 25 m/s, acceleration due to gravity is g = 10 m/s2, what is the maximum horizontal range covered? a) 54.13 m b) 49 m c) 49.16 m d) 60 m 3. A body of mass 10 kg, projected at an angle of 30° from the ground with an initial velocity of 5 m/s, acceleration due to gravity is g = 10 m/s2, what is the time of flight? a) 0.866s b) 1.86 s c) 1.96 s d) 1.862s 4. On calculating which of the following quantities, the mass of the body has an effect in simple projectile motion? a) Velocity b) Force c) Time of flight d) Range 5. A ball of mass 100 g, projected at an angle of 30° from the ground with an initial velocity of 11 m/s, acceleration due to

 

  Q1: A stone is just released from the window of a train moving along a horizontal straight track. The stone will hit the ground following Hyperbolic path Straight path Circular path Parabolic path Answer: (d) Parabolic path Q2: A bullet is dropped from the same height when another bullet is fired horizontally. They will hit the ground Simultaneously Depends on the observer One after the other None of the above Answer: (b) Simultaneously Q3: A bomb is dropped from an aeroplane moving horizontally at a constant speed. When air resistance is taken into consideration, the bomb Flies with the aeroplane Falls to earth behind the aeroplane Falls to earth ahead of the plane Falls to earth exactly below the aeroplane Answer: (b) Falls to earth behind the aeroplane Q4: The maximum range of gum on horizontal terrain is 16 km. If g = 10 m/s2. What must be the muzzle velocity of the shell? 400 m/s 100 m/s 200 m/s 50 m/s Answer: (a) 400 m/s Q5: An aeroplane flying 490 m above ground level at 100 m

   

Motion in a Straight Line Class 11 MCQs  Questions with Answers Question 1. The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to (a) 1 s (b) 2 s (c) 3 s (d) 4 s Answer Answer: (b) 2 s Question 2. A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is (a) 3 km/h (b) zero (c) 2 km/h (d) 1.5 km/h Answer Answer: (a) 3 km/h Question 3. A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is (a) 10 s (b) 12 s (c) 9 s (d) 6 s Answer Answer: (d) 6 s Question 4. A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is (a) 3 km/h (b) zero (c) 1.5 km/h (d) 2 km/h Answer Answer: (b) zero Question 5. A

  1. Which one of the following Cartesian coordinate systems is not followed in physics? Ans: d   2. Identify the unit vector in the following. Ans: d     3. Which one of the following physical quantities cannot be represented by a scalar?   (a) Mass (b) length (c) momentum (d) magnitude of acceleration   4. Two objects of masses m 1  and m 2  fall from the heights h 1  and h 2  respectively. The ratio of the magnitude of their momenta when they hit the ground is Ans: c     5. If a particle has negative velocity and negative acceleration, its speed   (a) increases (b) decreases (c) remains same (d) zero   6. If the velocity is  , then the magnitude of acceleration at t = 0.5 s is   (a) 1m s -2 (b) 2 m s -2 (c) zero (d) -1 m s -2   7. If an object is dropped from the top of a building and it reaches the ground at t = 4 s , then the height of the building is (ignoring air resistance) (g = 9.8 ms –2 )   (a) 77.3 m (b) 78.4 m (c) 80.5 m (d) 79.2 m   8. A ball is projected vertically upward