NCERT (Physics) Class-IX
Playlist: -
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for balanced forces? 1. It can set A stationary body into motion, 2. It cannot change the speed. 3. It may change the shape and size of A soft object. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correctly matched? 1. First law of motion-----resists A. change in state of rest. 2. Second law of motion-------defines force. 3. Third law of motion----------resists A. change in state of motion. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are not application/s of second law of motion? 1. Travelling in a motorcar. 2. Catching a fast moving cricket ball. 3. High jump athletic event. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Law of conservation of momentum is based on: | ||
| PhysicsDate Added: 2022-05-21 Which of the following statements is/are correct for centripetal force? 1. It keeps the body moving along the circular path. 2. The object flies off along a straight line. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following statements is/are correct for gravitational force? 1. All objects in the universe attract each other. 2. The force between two objects is directly proportional to the square of the distance between them. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following statements is/are correct for Kepler's laws? 1. The orbit of a planet is an circle. 2. The cube of the mean distance of a planet from the Sun is proportional to the square of its orbital period. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are the applications of gravitational force? 1. the force that binds us to the earth; 2. the motion of the moon around the earth; 3. the motion of planets around the Sun Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for thrust and pressure? 1. The force acting on an object perpendicular to the surface is called thrust. 2. The thrust on unit area is called pressure. 3. SI unit of pressure is called pascal. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are conditions for work done? 1. A. force should act on an object. 2. The object must cover distance. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for energy? 1. The energy possessed by an object is measured in terms of its capacity of doing work. 2. Its S.I. unit is kJ. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correctly matched? 1. Kinetic energy----------motion 2. Potential energy--------position 3. Mechanical energy----------kinetic energy + heat energy Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for law of conservation of energy? 1. Energy can be converted from one form to another. 2. It can be created. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for power? 1. Power measures the speed of motion. 2. It was given by James Watt. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for sound? 1. It is A. form of energy. 2. It does not need A. medium to travel. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for waves? 1. It is a disturbance in the medium. 2. Sound waves are mechanical waves. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correctly matched? 1. Longitudinal wave---------------direction of particles parallel to direction of propagation. 2. Transverse wave-----------------direction of particles perpendicular to direction of propagation. 3. Compression-----------------density is low. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are true for speed of sound? 1. The speed of sound in a medium is inversely proportional to the temperature of the medium. 2. The speed of sound decreases when we go from solid to gaseous state. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the followings is/are uses of multiple reflection of sound? 1. Megaphones or loudhailers, horns 2. Stethoscope 3. Optical Fibre Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are true for ultrasound? 1. It is a low frequency sound. 2. It is used to detect flaws in metal block. 3. It is used to get image of internal organs. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for displacement? 1. It is the shortest distance between initial and final point. 2. Its S.I unit is metre. 3. It is A. scalar quantity. Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correctly matched? 1. Speed------scalar 2. Velocity-----vector 3. Acceleration-----vector Choose the correct option from the codes given below: | ||
| PhysicsDate Added: 2022-05-21 Which of the following is/are correct for distance-time graphs? 1. Time is taken along the y-axis. 2. It determines the speed of an object. 3. It can also be plotted for accelerated motion. Choose the correct option from the codes given below: | ||