Stars and the Solar System — Science STD 8 — Question

Brahma rolls down a ball from a certain height along an inclined plane. After reaching the bottom of the inclined plane, the ball rolls some distance horizontally along a surface. Brahma uses four different objects as the horizontal surface at the bottom of the inclined plane. The four objects are frosted glass sheet, cardboard sheet, sand paper, and wrinkle-free towel. In each case, he measures the distance travelled by the ball from the bottom of the inclined plane along the horizontal surface. On which surface will the ball move the least distance?

Deforestation takes place by.

Look at the given figure.

Find the angle between the incident ray and the reflected ray.

Reproduction is essential for living organisms in order to:

Muscular force is a type of:

Which of the following metals reacts with cold water vigorously?

Which of the following human disease can be prevented by the same hormone which brings about metamorphosis in frogs?

When a glass rod is rubbed with a silk cloth, then the charge on the silk cloth is:

Which of the following is NOT a type of solution based on the physical state of the solvent?