Q. 66. With reference to dark matter, consider the following statements:
1. It is completely invisible as it does not interact with light.
2. It does not interact with gravity.
3. It is made up of particles that do not have a charge.
How many of the above statements are correct?
(A) Only one
(B) Only two
(C) All three
(D) None
Answer:
Explanation:
Q. 67. Consider the following statement regarding Sounding rocket:
1. Sounding rockets are one or two stage solid propellant rockets used for probing upper atmospheric regions.
2. Currently, ISRO uses sounding rockets for meteorology and aeronomy purposes.
Which of the statements given above is/are incorrect?
(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2
Answer:
Explanation:
\Q. 68. With reference to ‘3D food printers’, consider the following statements:
1. It can print food items which mimic real-life seafood and non-veg food dishes.
2. It involves the use of animal stem cells to manufacture meat products.
3. It can be used to prepare ready-to-eat meals with longer shelf life for Human Space missions.
How many of the above statements are correct?
(A) Only one
(B) Only two
(C) All three
(D) None
Answer:
Explanation:
Q. 69. Consider the following statements with respect to Lab Grown Diamonds (LGDs):
1. They are created when carbon deposits buried within the Earth are exposed to extreme heat and pressure.
2. They have similar physical composition and optical properties as that of the naturally-occurring diamonds.
3. It has a significantly smaller environmental impact than a naturally occurring diamond.
How many of the above statements are correct?
(A) Only one
(B) Only two
(C) All three
(D) None
Answer:
Explanation:
Q. 70. Ethanol-blended petrol is primarily derived from organic sources such as sugarcane. In the context of the effects of ethanol blending in petrol consider the following:
1. It leads to reduction in the octane number.
2. It drastically reduces the efficiency of fuel.
3. It increases the price of fuel.
How many of the above statements are correct?
(A) Only one
(B) Only two
(C) All three
(D) None
Answer:
Explanation: