The correct answer is Option 2 i.e. Tesla.

The unit of measure for magnetic flux density in the SI system is named after Nikola Tesla, a Serbian-American inventor and electrical engineer renowned for his contributions to electromagnetism. This unit is called the Tesla (symbol: T). It represents the magnetic flux density experienced by a conductor carrying a current of one ampere within a magnetic field of one tesla, perpendicular to the field. It quantifies the strength of a magnetic field and is crucial in various fields, including physics, engineering, and medicine.

The correct answer is Option 1 i.e. Diffraction.

Diffraction occurs when light waves bend around obstacles or pass through small openings, causing them to spread out rather than forming a sharp shadow edge. This spreading effect is more pronounced when the obstruction or aperture is comparable to or smaller than the wavelength of light. Diffraction is responsible for softening the edges of shadows and is a fundamental aspect of wave behavior in optics, influencing various phenomena from photography to astronomy.

The correct answer is Option 3 i.e. Inertia is the tendency of an object to resist changes in its state of motion.

• Inertia is a property of matter that causes it to resist any change in its motion, whether that motion is moving in a straight line at constant speed or remaining at rest.
• It is directly related to the mass of the object but does not depend on the object's speed or weight.

The correct answer is Option 1 i.e. Always conserved.

In a closed system without external forces, the total momentum before and after a collision is always conserved, meaning it remains constant. This is due to the law of conservation of momentum, which states that the total momentum of a system does not change unless acted upon by external forces. During a collision, individual objects may exchange momentum, but the overall momentum of the system as a whole stays the same, ensuring equilibrium in both elastic and inelastic collisions.

The correct answer is Option 3 i.e. Its acceleration remains constant.

This is because, in free fall, the only force acting on the object is gravity, which imparts a constant acceleration towards the Earth. This acceleration, denoted as g, is approximately 9.8 m/s² near the Earth's surface. The velocity of the object increases continuously in the direction of the gravitational force, but the rate of this increase, or acceleration, remains constant.

The correct answer is option 1 i.e. Pressure.

The force applied perpendicular to the surface of an object per unit area is called "pressure." Pressure is a fundamental concept in physics and engineering, defined as the ratio of force (F) exerted perpendicular to the surface to the area (A) over which the force is distributed. Mathematically, pressure (P) can be expressed as P = F/A. The SI unit of pressure is the pascal (Pa), which is equal to one newton per square meter (N/m²).

The correct answer is Option 3 i.e. Directly Proportional.

• According to Newton's second law of motion, the rate at which the linear momentum of a body changes is directly proportional to the magnitude of the external force applied to the body.

• This change occurs in the direction of the applied force. Newton's second law also establishes that the acceleration of an object relies on two factors: the net force acting on it and its mass.

• This law is mathematically represented as F = m × a, where F represents force, m represents mass, and a represents acceleration.

The correct answer is option 4 i.e. All of these.

The universal law of gravitation states that any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

The Gravitational force formula is given by-

F= (Gm₁m₂/r²)

Where,

G is the universal gravitational constant,

m₁ and m₂ are masses of bodies

r is the radius between the two masses

The correct answer is option 2 i.e. Coal.

Coal is the most widely used energy source for electricity generation in India. The country has abundant coal reserves, making it a primary and economically viable option for power production. Coal-fired power plants dominate India's energy mix, contributing significantly to the national grid. Despite the growing emphasis on renewable energy sources like solar and wind, coal remains the backbone of India's electricity generation due to its availability and established infrastructure.

The correct answer is option 3 i.e. 2000 J.

• Work is done when a force that is applied to an object moves that object. The work is calculated by multiplying the force by the amount of movement of an object

• To find: Work done

  Given:

  Force = 40N

  Displacement = 50m

  work done = force(F) × displacement(D)

  = 40 × 50

  = 2000 J