Every question from this NCERT chapter, with a detailed explanation.
The phenomenon of an object falling towards the Earth's surface when released is caused by:
Porters often place a round piece of cloth on their heads before carrying heavy loads. What is the scientific principle behind this practice?
Which one of the following principles explains why a sharp knife cuts vegetables more effectively than a blunt one?
School bags are typically designed with broad straps rather than thin ones. This design feature is intended to:
If the surface area over which a constant force is applied is doubled, how will the pressure exerted on that surface change?
In an experiment, water jets emerging from holes drilled at the same height on a container travel the same horizontal distance. This observation demonstrates that:
With reference to 'Muscular Force', consider the following statements: 1. It is the force resulting due to the action of muscles. 2. It can be applied to an object without being in contact with it. 3. It is responsible for the expansion and contraction of lungs during breathing. Which of the statements given above are correct?
Consider the following statements regarding 'Friction': 1. It is a non-contact force. 2. It always acts in the direction opposite to the direction of motion. 3. It arises due to contact between surfaces. Which of the statements given above is/are correct?
Consider the following statements about the force of gravity: 1. It acts only on objects that are in motion. 2. It acts on objects without being in contact with them. 3. It is an attractive force. Which of the statements given above is/are correct?
Consider the following statements regarding the 'Force of Friction': 1. It arises due to the contact between two surfaces. 2. It acts in the same direction as the motion of the object. 3. It is a non-contact force acting on a rolling ball. Which of the statements given above is/are correct?
With reference to fluid statics, which one of the following statements correctly describes the pressure exerted by a liquid in a container?
In an experiment, water flows out from four holes drilled at the same height around a container and falls at equal distances from the base. This observation validates that:
When the bulb of a dropper is pressed and released while immersed in water, water rises into the dropper. This phenomenon is primarily driven by:
In the context of mechanics, the principle that "force is the result of an interaction" implies that:
Consider the following statements about 'Muscular Force': 1. It is a non-contact force. 2. It arises due to the action of muscles. 3. It enables processes like digestion. Which of the statements given above is/are correct?
A bicycle moving on a level road gradually slows down and stops after the rider ceases pedaling. This deceleration is primarily caused by:
In a tug-of-war, if the rope remains stationary despite both teams pulling, which of the following physical conditions is met?
Consider the following statements regarding the application of force: 1. A goalkeeper stopping a ball increases its speed. 2. A hockey player flicking a ball changes its direction of motion. 3. Pushing a tyre repeatedly in the direction of motion increases its speed. Which of the statements given above is/are correct?
Which of the following parameters of an object is generally not altered by the application of an external force?
Consider the following situations: 1. Squeezing a lump of dough with hands. 2. Stretching a rubber band to change its color. 3. Placing a weight on a plastic scale to break it instantly. In which of the above situations does the force result in a change of shape?
A rowing boat eventually comes to a halt after rowing ceases primarily due to the action of:
With reference to 'Magnetic Force', consider the following statements: 1. A magnet can exert a force on another magnet without being in contact with it. 2. The force exerted by a magnet on a piece of iron is a contact force. 3. Like poles of two magnets attract each other. Which of the statements given above is/are correct?
Consider the following statements regarding 'Gravitational Force': 1. It is an attractive force. 2. It acts only on objects present on the Earth. 3. It is a non-contact force. Which of the statements given above are correct?
The attraction or repulsion observed between plastic objects that have been rubbed with dry materials is a manifestation of:
A rubber sheet fixed to the side of a liquid-filled container bulges outward. This phenomenon primarily demonstrates that:
Water gushing out from leaking joints in supply pipes is a common observation. What is the most appropriate scientific explanation for this phenomenon?
The adhesion of a rubber suction cup to a smooth surface is primarily caused by:
Despite the immense weight of the atmospheric column, human bodies do not collapse. This is primarily because:
If the air is completely removed from the space between a rubber suction cup and a smooth surface, which one of the following would occur?
Iron nails are designed with pointed ends to facilitate insertion into wood. This design utilizes the principle that:
Consider the following statements about the pressure exerted by liquids: 1. It depends on the height of the liquid column. 2. It is exerted only at the bottom of the container. 3. It is exerted only in the downward direction. Which of the statements given above is/are correct?
Which one of the following statements correctly describes the direction of the frictional force acting on a moving object?
A plastic comb rubbed against dry hair attracts small bits of paper. This phenomenon is an example of: