UPSC CSE: Science and Technology Test 5

Consider the following statements:

1) Saliva breaks down starch, a complex molecule which provides simple sugar.

2) Saliva contains an enzyme called salivary amylase.

Which of the statements given above is/are correct?

Consider the following statements:

1) A rainbow is a natural spectrum which is formed by refraction of light.

2) Twinkling of stars is caused due to phenomena of dispersion of light.

Which of the statements given above is/are correct?

Consider the following statements:

1) The speed of sound increases when it goes from solid to gaseous state.

2) Sonic boom is produced when the speed of any object exceeds the speed of sound.

Which of the statements given above is/are correct?

Consider the following statements with reference to Insulin production in body

1) Insulin is a hormone that the pancreas produces which helps to control blood sugar levels.

2) The insulin production is decreased as blood sugar levels decrease.

Which of the statements given above is/are correct?

Consider the following statements:

1) The energy required for various chemical activities needed for life is released by mitochondria in the form of ATP molecules.

2) Plastids are present in plant as well as animal cells.

Which of the statements given above is/are correct?