Motion and Force
Description: Motion and force (D) | |
Number of Questions: 15 | |
Created by: | |
Tags: Motion and force (D) Science and Technology CHSL (Combined Higher Secondary Level) Motion and Force |
Which of the following statements is/are true?
- Tyres have geometrical pattern to reduce the friction.
- The straps of the shoulder bags are made broad to decrease the pressure by increasing the area of contact
- Aeroplanes and boats have streamlined shapes to reduce the resistance offered by air and water, respectively.
Consider the following statements:
- When a person is standing on a weighing scale in a lift, which is moving upwards, the weighing scale shows lesser weight.2. The weight of an object would be minimum, when it is placed at the north pole of earth.
- The weight is a measure of the quantity of matter.
Which of the given statements is/are incorrect?
Consider the following statements: (1). There are chances of toppling when a truck takes a sharp turn specially when it is fully loaded because it increases the rotational force. (2). While throwing a ball upwards, the velocity remains the constant.
Which of the given statements is /are correct?
Which of the following statements is/are true? (1) When a coolie goes upstairs with a load on his head, work is said to be done. (2) A vehicle moving on a circular path experiences centrifugal force. (3) If a boy sitting in a railway train, moving at constant velocity, throws a ball straight up into the air, the ball will fall in front of him.
Consider the following statements:
- A body will weigh less in air than in vacuum, when weighed with a spring balance.
- When a barometer is taken to a mine, the height of mercury column increases.
Which of the given statements is/are correct?
Which of the following statement is/are correct? Assertion: A boy is holding a wooden ply in his hands. The boy would feel a decrease in weight of the ply when the bird flies up, which was resting on the ply initially. Reason: According to Newton's law of motion, action and reaction will be twice to each other.
Consider the following statements:1. In a beaker, a plank of wood floats in water. If the beaker moves with a vertical acceleration, the wooden plank will sink deeper into the liquid.
- An ice cube containing a lead piece in it is floating in a glass of water. As ice melts, the water level will fall.
Which of the given statements is/are correct?
Assertion: If a small part separates from an orbiting satellite, the part will move in a spiral and reach the earth after a few rotations. Reason: The satellite comes to earth due to attraction by earth as gravitational force.
Which of the given statements is/are true?
Consider the following statements:1. If somehow the distance between the sun and the earth is doubled, the gravitational force between them will increase.
- To reduce the force of friction, the carpenters use the sand paper to polish the wood.
Which of the given statements is /are correct?
Assertion: If an egg is placed in a tall vessel and water is poured into the vessel, the egg remains at the bottom but if salt is added and water is stirred the egg rises and floats. Reason: Salt added in the water enters into the egg and decrease the weight by shrinking.
Consider the following statements:
- An athlete made to fall on a cushioned bed or on a sand bag to decrease the pressure.
- The base of the tower is larger than the rest of the tower due to centre of gravity.
Which of the given statements is/are correct?
Assertion: While scuba diving, the person notices air bubbles underwater. The size of a bubble is small when it is deep underwater. But the size increases as it moves upwards. Reason: More air enters into the bubbles from top and leads to increase in size.
Consider the following statements:
- When a body is in circular motion, work is said to be done by centripetal force.
- The hand flour grinder is provided with a handle near its rim to reduce the centre of gravity.
Which of the given statements is/are incorrect?
Consider the following statements:1. In a case of uniform circular motion, the acceleration is variable in magnitude but constant in direction.
- The force applied as push, pull, stretch and squeeze is called mechanical force.
Which of the given statements is/are incorrect?
Consider the following statements:
- The gravitational force with which the earth attracts the moon is equal to the force with which the moon attracts the earth.
- The weight of a body at the centre of earth is slightly less than that at the surface.
Which of the given statements is/are correct?