HSC Science इयत्ता ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions

If the ratio of the orbital distance of two planets `"d"_1/"d"_2` = 2, what is the ratio of gravitational field experienced by these two planets?

Calculate the gravitational field at point O due to three masses m₁, m₂ and m₃ whose positions are given by the following figure. If the masses m₁ and m₂ are equal what is the change in a gravitational field at the point O?

What is the gravitational potential energy of the Earth and Sun? The Earth to Sun distance is around 150 million km. The mass of the Earth is 5.9 × 10²⁴ kg and the mass of the Sun is 1.9 × 10³⁰ kg.

Earth revolves around the Sun at 30 km s⁻¹. Calculate the kinetic energy of the Earth. In the previous example, you calculated the potential energy of the Earth. What is the total energy of the Earth in that case? Is the total energy positive? Give reasons.

An object is thrown from Earth in such a way that it reaches a point at infinity with non-zero kinetic energy `["K"."E"("r" = ∞) = 1/2 "Mv"_"∞"^2]`, with what velocity should the object be thrown from Earth?

Consider two wires X and Y. The radius of wire X is 3 times the radius of Y. If they are stretched by the same load then the stress on Y is ___________.

If a wire is stretched to double of its original length, then the strain in the wire is __________.

The load-elongation graph of three wires of the same material as shown in the figure. Which of the following wire is the thickest?

For a given material, the rigidity modulus is `(1/3)^"rd"` of Young’s modulus. Its Poisson’s ratio is

Two wires are made of the same material and have the same volume. The area of cross-sections of the first and the second wires are A and 2A respectively. If the length of the first wire is increased by ∆l on applying a force F, how much force is needed to stretch the second wire by the same amount?

The Young’s modulus for a perfect rigid body is __________.

Which of the following is not a scalar?

If the temperature of the wire is increased, then Young’s modulus will __________.

Copper of fixed volume V is drawn into a wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is ∆l. If Y represents Young’s modulus, then which of the following graphs is a straight line?

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

Define stress.

Define strain.

State Hooke’s law of elasticity

Define Poisson’s ratio.

Which one of these is more elastic, steel or rubber? Why?