Ray Optics — Physics STD 12 Science — Question

In the previous question, the smallest kinetic energy at the bottom of the incline will be achieved by:

1. The solid sphere.
2. The hollow sphere.
3. The disc.
4. All will achieve same kinetic energy.

In image formation from spherical mirrors, only paraxial rays are considered because they:

1. Are easy to handle geometrically.
2. Contain most of the intensity of the incident light.
3. Form nearly a point image of a point source.
4. Show minimum dispersion effect.

A hole is:

What is immaterial for an electric fuse wire(a) Its specific resistance(b) Its radius(c) Its length(d) Current flowing through it

The velocity-time plot for a particle moving on a straight line is shown in the figure:

1. The particle has a constant acceleration.
2. The particle has never turned around.
3. The particle has zero displacement.
4. The average speed in the interval 0 to 10s is the same as the average speed in the interval 10s to 20s.

In a streamline flow:

1. The speed of a particle always remains same.
2. The velocity of a particle always remains same.
3. The kinetic energies of all the particles arriving at a given point are the same.
4. The momenta of all the particles arriving at a given point are the same.

The SI unit of electrical energy is ____________?

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of combination is(a) – 1.5 D (b) – 6.5 D(c) + 6.5 D(d) + 6.67 D

Coulomb force and gravitational force follows the: