Multiple Choice Questions | Chapter 2 | Kinematics | 9th Physics New Book | National Book Foundation скачать в хорошем качестве

Multiple Choice Questions | Chapter 2 | Kinematics | 9th Physics New Book | National Book Foundation

Change in position of a body from initial to final point is called: (a) Distance (b) Displacement (c) Speed (d) Velocity Motion of a screw of rotating fan is: (a) Circular motion (b) Vibratory motion (c) Random motion (d) Rotatory motion A cyclist is travelling in a westward direction and produces a deceleration of 8〖ms〗^(-2) to stop. The direction of its acceleration is towards (a) North (b) East (c) South (d) West A girl walks 3km towards west and 4km towards south. What is the magnitude of her total distance and displacement respectively? (a) 7km, 7km (b) 1km, 7km (c) 7km, 1km (d) 7km, 5km A rider is training a horse. Horse moves 60 metres towards right in 3 seconds. Then it turns back and travels 30 metres in 2 seconds. Find its average velocity. (a) 6〖ms〗^(-1) (b) 18〖ms〗^(-1) (c) 35〖ms〗^(-1) (d) zero If a cyclist has acceleration of 2〖ms〗^(-2) for 5 seconds, the change in velocity of the cyclist is (a) 2〖ms〗^(-1) (b) 10〖ms〗^(-1) (c) 20〖ms〗^(-1) (d) 15〖ms〗^(-1) A car is moving with velocity of 10〖ms〗^(-1). If it has acceleration of 2〖ms〗^(-2) for 10 seconds. What is final velocity of the car? (a) 30〖ms〗^(-1) (b) 20〖ms〗^(-1) (c) 10〖ms〗^(-1) (d) 15〖ms〗^(-1) When the slope of a body’s displacement-time graph increases, the body is moving with: (a) increasing velocity (b) decreasing velocity (c) constant velocity (d) all of these A ball is thrown straight up, what is the magnitude of acceleration at the top of its path? (a) zero (b) 9.8〖ms〗^(-2) (c) 4.9〖ms〗^(-2) (d) 19.6〖ms〗^(-2) Slope of distance-time graph is (a) velocity (b) acceleration (c) speed (d) displacement Area under speed-time graph is equal to _______ of moving body: (a) distance (b) change in velocity (c) uniform velocity (d) acceleration In 5s a car accelerates so that its velocity increases by 20〖ms〗^(-1). The acceleration is (a) 0.25〖ms〗^(-2) (b) 4〖ms〗^(-2) (c) 25〖ms〗^(-2) (d) 100〖ms〗^(-2) Ball dropped freely from a tower reaches ground in 4s, the speed of impact of ball is: (a) 0〖ms〗^(-1) (b) 2.45〖ms〗^(-1) (c) 19.6〖ms〗^(-1) (d) 39.2〖ms〗^(-1) Which of following distance time graphs represents increasing speed of a car? (a) (b)  (c) (d) In a park, children are enjoying a ride on Ferris wheel as shown. What kind of motion the big wheel has and what kind of motion the riders have? A boy moves for some time, give two situations in which his displacement is zero but covered distance is not zero? A stone tied to string is whirling in circle, what is direction of its velocity at any instant? Is it possible to accelerate an object without speeding it up or slowing it down? Can a car moving towards right have direction of acceleration towards left? With the help of daily life examples, describe the situations in which: a. acceleration is in the direction of motion. b. acceleration is against the direction of motion. c. acceleration is zero and body is in motion. Examine distance-time graph of a motorcyclist (as shown), what does this graph tell us about the speed of motorcyclist? Also plot its velocity-time graph. Which controls in the car can produce acceleration or deceleration in it? If two stones of 10kg and 1kg are dropped from a 1km high tower. Which will hit the ground with greater velocity? Which will hit the ground first? (Neglect the air resistance) A 100g ball is released (from rest) and another is thrown downward with velocity of 10〖ms〗^(-1), which will have greater acceleration? (Neglect the air resistance) The acceleration due to gravity is the same no matter the speed is. But the air resistance is higher, the faster you Q4. Solve the questions given below. Convert the following: a. 160kmh^(-1) into 〖ms〗^(-1) b. 36ms^(-1) into kmh^(-1) c. 15kmh^(-2) into 〖ms〗^(-2) =15kmh^(-2) d. 1ms^(-2) into kmh^(-2) In 10 second, a cyclist increases its speed from 5kmh^(-1) to 7kmh^(-1), while a car moves from rest to 20kmh^(-1) in same time. Calculate and compare acceleration in each case. A ball is thrown straight up such that it took 2 seconds to reach the top after which it started falling back. What was the speed with which the ball was thrown up? A car is moving with uniform velocity of 20〖ms〗^(-1) for 20 seconds. Then brakes are applied and it comes to rest with uniform deceleration in 30s. Plot the graph to calculate this distance using speed time graph? A girl starts her motion by a racing bicycle in a straight line at a speed of 50〖kmh〗^(-1). Her speed is changing at a constant rate. If she stops after 60s, what is her acceleration? Consider the following speed time graph. Tell: a. Which part of the graph is showing acceleration, deceleration and zero acceleration? b. Calculate covered distance from 10 seconds to 20 seconds from the graph.