Moving Things People and Ideas - 2 - Free MCQ Practice Test with solutions,

Friction opposes the relative motion between two surfaces in contact. Frictional force acts in opposite direction of motion to slow down the speed of moving body.

A push or pull on an object is called force. Force can make stationary body in motion and moving body in rest.

Atmospheric Pressure

• Atmospheric pressure is the force exerted by the weight of air above any given point on the Earth's surface.
• It is caused by the molecules in the air being pulled down by gravity towards the Earth's surface.
• At sea level, the average atmospheric pressure is about 14.7 pounds per square inch (psi) or 101.3 kilopascals (kPa).
• As altitude increases, atmospheric pressure decreases because there is less air above pushing down.
• Changes in atmospheric pressure can affect weather patterns and can have an impact on the human body, especially at high altitudes.

 

The force on an object is zero if the two forces acting on it in opposite directions are equal in magnitude. This kind of force is called balanced force.

The distance between two edges of a writing board is typically measured in centimeters for smaller lengths.
Therefore, the correct answer is (b) Centimeter.

- Velocity is the correct answer.
- It represents the rate at which an object changes its position in a specific direction
- Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
- It indicates how fast an object is moving and in which direction.
- Unlike speed, which is scalar and only measures how fast something moves, velocity specifically accounts for direction, making it crucial for describing motion in physics accurately.

Atomic watches are the most accurate of all wristwatches. An atomic watch is a wristwatch that is radio-controlled to keep the most accurate time on earth. An atomic watch never needs to have its time or date set/adjusted because it receives a low frequency radio signal each night that keeps it perfectly synchronized with the US atomic clock in Colorado.

A force applied on an object may change its speed. 

If the force applied on the object is in the direction of its motion, the speed of the object increases.
If the force applied on the object is in the direction opposite to the direction of motion, the speed of the object decreases.

In a game of tug-of war, two teams pull the rope in opposite direction. The team that pulls the rope toward itself will become winner.

Ten millimetre is equal to 1 centimetre.

The distance between two edges of writing board is measured in centimetre.

The basic unit of distance is metre (m). The basic unit of time is second (s). Therefore, the basic unit of speed is m/s.

So option D is the correct answer. 

1 centimeter is equal to 10 millimeters.
Therefore, the correct answer is (c) 10 mm.

Gravitational Force

- Gravitational force is the force exerted by the earth (or any other massive object) to pull objects towards itself.
- This force is responsible for keeping planets in orbit around the sun, objects on the surface of the earth, and many other phenomena in the universe.
- The strength of the gravitational force depends on the masses of the objects and the distance between them.
- It follows the law of gravitation formulated by Sir Isaac Newton, which states that the force of gravity is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between them.
- Gravitational force is a fundamental force of nature and plays a crucial role in the functioning of the universe.

• Force acting per unit area is termed as pressure.
• Pressure = force/ area on which it acts
• As area is in the denominator So, the smaller the area, larger the pressure on a surface for the same force.

Therefore, the correct answer is C: Pressure.

 We know , 
1 km=1000m , 1 hour=3600s
1km/h=1000/3600m/s=5/18m/s
72km/h=72×5/18m/s
=4×5m/s
=20m/s.

Speed time graph is straight line parallel to x-axis for uniform motion of the body.

- Periodic Motion: The movement of fan blades is considered periodic motion because they repeat a pattern at regular time intervals. When a fan is turned on, its blades continuously rotate around a central axis at a constant speed, creating cycles of motion that repeat consistently.
- Other Options:
- Non-periodic motion refers to movements without regular intervals, which does not apply to fan blades.
- Rectilinear motion involves straight-line paths, not applicable to rotating blades.
- Thus, the correct answer is A: Periodic motion.

 The motion of a bullet fired from a gun is a rectilinear motion. 
The motion of a body in a straight line is known as rectilinear motion
Motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity, acceleration, time and speed.

We sprinkle powder on carrom board to make the surface of the board smooth. This reduces the friction between the surface of the carrom board, the striker and the coins. As a result, the coins and the striker can move easily on the carrom board.