Science
Assertion (A): Sun appears reddish at the time of Sunrise and Sunset.
Reason (R): Distance travelled by sunlight in the atmosphere is lesser during sunrise and sunset as compared to noon.
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
A is true and R is false.
Reason — During the sunrise and sunset, the sun is near the horizon and most of the blue light and shorter wavelengths are scattered away by the particles. Therefore, the light that reaches our eyes is of longer wavelength. This gives rise to the reddish appearance of the sun.
During sunrise and sunset, sun is at a farther distance while at noon sun is directly overhead. Hence, distance travelled by sunlight in the atmosphere is more during sunrise and sunset as compared to noon.
Related Questions
Assertion (A): Hydrochloric acid helps in the digestion of food in the stomach.
Reason (R): Hydrochloric acid creates an acidic medium to activate protein digesting enzymes.
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
A student was asked to write a stepwise procedure to demonstrate that carbon dioxide is necessary for photosynthesis. He wrote the following steps. The wrongly worded step is:
- Both potted plants are kept in dark rooms for at least three days.
- Bottom of the bell jars is sealed to make them air tight.
- Both potted plants are kept in sunlight after the starch test.
- A leaf from both the plants is taken to test the presence of starch.
Assertion (A): Nitrogen is an essential element for plant growth and is taken up by plants in the form of inorganic nitrates or nitrites.
Reason (R): The soil is the nearest and richest source of raw materials like Nitrogen, Phosphorus and other minerals for the plants.
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Burning of Natural gas is an endothermic process.
Reason (R): Methane gas combines with oxygen to produce carbon dioxide and water.
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.