NMMS - National Means-cum-Merit Scholarship Science: Force, Pressure, and Light Questions and Answers

Question 1

A student observes that a sharp knife cuts vegetables more effectively than a blunt knife. Which of the following principles best explains this observation?

Accepted Answer

The pressure exerted is inversely proportional to the area over which the force is applied.

Answer

The force applied by a sharp knife is greater than that of a blunt knife.

Answer

The pressure exerted is directly proportional to the area over which the force is applied.

Answer

Friction is greater with a blunt knife, making it harder to cut.

Question 2

When a rocket is launched, it pushes hot gases downwards. According to Newton's Third Law of Motion, what is the corresponding reaction force?

Accepted Answer

The rocket accelerating upwards.

Answer

The gravitational force pulling the rocket down.

Answer

The air resistance opposing the rocket's motion.

Answer

The force of the gases pushing against the launchpad.

Question 3

A beam of white light passes through a glass prism and splits into a spectrum of colors. Which color of light is bent the most?

Accepted Answer

Violet

Answer

Red

Answer

Yellow

Answer

Green

Question 4

Why does a mountaineer climbing at a high altitude often experience nosebleeds?

Accepted Answer

The atmospheric pressure outside the body is significantly lower than the blood pressure inside.

Answer

The temperature is much lower at high altitudes.

Answer

The force of gravity is weaker at high altitudes.

Answer

There is less oxygen available, causing blood vessels to expand.

Question 5

Which of the following is an example of an image formed by a plane mirror?

Accepted Answer

A virtual, erect, and same-sized image.

Answer

A real, inverted, and diminished image.

Answer

A virtual, erect, and magnified image.

Answer

A real, erect, and same-sized image.

Question 6

A force of 20 Newtons is applied to an object with a mass of 5 kg. What is the acceleration of the object, assuming no other forces are acting on it?

Accepted Answer

4 m/s²

Answer

100 m/s²

Answer

0.25 m/s²

Answer

15 m/s²

A student observes that a sharp knife cuts vegetables more effectively than a blunt knife.Which of the following principles best explains this observation?

A student observes that a sharp knife cuts vegetables more effectively than a blunt knife.
Which of the following principles best explains this observation?