Tamil Nadu Board Class 9 Science — Important Questions 2026

In a Vernier caliper, the zero of the Vernier scale is shifted to the right of the zero of the main scale, and the 5th Vernier division coincides with a main scale division. What is the zero correction to be applied?

The pitch of a screw gauge is 1 mm and the head scale has 100 divisions. What is its least count?

Which instrument works on Hooke's law to measure the weight of an object?

A man has a mass of 60 kg on Earth. What is his weight on Earth? (Take g = 9.8 m/s²)

Which of the following correctly distinguishes between distance and displacement?

From a velocity-time graph of a uniformly accelerated body, the acceleration can be calculated as:

A car accelerates from rest. In the first second it travels 10 m. Assuming uniform acceleration, what distance will it cover in the third second alone (not cumulative)?

An object moves in a circular path of radius 7 m with a uniform speed and completes one revolution in 11 seconds. What is the speed of the object? (Use π = 22/7)

A block has a mass of 540 g and volume of 600 cm³. What will happen when it is placed in a liquid of density 1.2 g/cm³?

Which of the following correctly explains why a ship made of iron floats while a small iron nail sinks?

In a Cartesian diver experiment, a pen cap with air barely floats in a bottle of water. When the bottle is squeezed, the diver sinks. What is the correct scientific explanation?

A person's true weight in air is 600 N. When fully submerged in a liquid of density 800 kg/m³, the apparent weight is 440 N. What is the volume of the person? (g = 10 m/s²)