Physics Challenge

According to Newton's first law of motion, an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an external force. True or False?

• True

• False

• Sometimes

• Maybe

Answer explanation

According to Newton's first law of motion, an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an external force. This statement is true.

What is the formula for calculating work done?

• Work = Force x Distance x sin(theta)

• Work = Force x Distance x tan(theta)

• Work = Force x Distance x cos(theta)

• Work = Force / Distance x cos(theta)

Answer explanation

The correct formula for calculating work done is Work = Force x Distance x cos(theta). This formula takes into account the force applied, the distance over which the force is applied, and the angle between the force and the direction of motion.

What is the SI unit of electric current?

• B

• C

• D

• A

Answer explanation

The SI unit of electric current is Ampere, denoted by the symbol A. Therefore, the correct answer is A.

What type of lens is used to correct farsightedness?

• Flat lens

• Concave lens

• Diverging lens

• Convex lens

Answer explanation

A convex lens is used to correct farsightedness by converging light rays onto the retina, helping to focus images properly.

What is the SI unit of heat energy?

• Joule (J)

• Newton (N)

• Watt (W)

• Volt (V)

Answer explanation

The SI unit of heat energy is Joule (J), which is a derived unit of energy in the International System of Units.

What type of wave requires a medium to propagate?

• Transverse waves

• Electromagnetic waves

• Longitudinal waves

• Mechanical waves

Answer explanation

Mechanical waves require a medium to propagate, unlike electromagnetic waves which can travel through a vacuum.

What is the term for a reaction that absorbs heat from its surroundings?

• Endothermic reaction

• Exothermic reaction

• Heat-absorbing reaction

• Thermodynamic reaction

Answer explanation

The term for a reaction that absorbs heat from its surroundings is an Endothermic reaction.

What is the law that states energy cannot be created or destroyed, only transformed from one form to another?

• Law of Energy Creation

• Law of Energy Destruction

• Law of Energy Transformation

• Law of Conservation of Energy

Answer explanation

The law that states energy cannot be created or destroyed, only transformed from one form to another is the Law of Conservation of Energy.

What is the SI unit of force?

• Kilogram

• Joule

• Meter

• Newton (N)

Answer explanation

The SI unit of force is the Newton (N), making it the correct choice among the options provided.

What is the formula for calculating power?

• Power = Work + Time

• Power = Work - Time

• Power = Work / Time

• Power = Work x Time

Answer explanation

The correct formula for calculating power is Power = Work / Time. This formula represents the relationship between power, work done, and time taken.