Daily Static MCQs for UPSC & State PSC Exams - Science and Technology (01 September 2023)

Daily Static MCQs Quiz for UPSC, IAS, UPPSC/UPPCS, MPPSC. BPSC, RPSC & All State PSC Exams

Subject : Science and Technology

1. Consider the following statements:

1. The main carbohydrates found in our food are in the form of starch and sugars.
2. If a food item contains starch then it can be tested with the help of dilute iodine solution.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Answer: (C)

Explanation: There are many types of carbohydrates. The main carbohydrates found in our food are in the form of starch and sugars. We can easily test if a food item contains starch. When we take a small quantity of a food item or a raw ingredient and put 2-3 drops of dilute iodine solution on it then a blue black colour indicates that it contains starch. Hence, both statements are correct.

2. Consider the following pairs

Name of acid Found in
1. Acetic acid Unripe mangoes
2. Oxalic acid Spinach
3. Tartaric acid Vinegar

Which of the pairs given above is/are correctly matched?

(a) 1 only
(b) 1 and 3 only
(c) 2 only
(d) 1, 2 and 3

Answer: (C)

Explanation:

Name of acid Found in
1. Citric acid Unripe mangoes
2. Oxalic acid Spinach
3. Acetic acid Vinegar

3. With reference to 'LiFi', consider the following statements:

1. It uses light as the medium for high-speed data transmission.
2. It is a wireless technology and is slower than 'WiFi'.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Answer: (A)

Explanation: Li-Fi technology is a ground-breaking light based communication technology which makes use of light waves instead of radio technology to deliver data. Li-Fi technology will enable faster, more reliable internet connections in future, even when the demand for data usage has outgrown the available supply from existing technology such as 4G, LTE and Wi-Fi. Using light to deliver wireless internet will also allow the connectivity in environments that do not currently support Wi-Fi such as aircraft cabins, hospitals, and hazardous environments. Hence, statement 2 is incorrect.

4.

Assertion (A): Unsaturated fats are more reactive compared with the saturated fats.
Reason (R): Unsaturated fats have only single bonds in their structure.

Code:

(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.

Answer: (C)

Explanation: Assertion (A) is true but (R) is not correct. A compound having a double bond in their structure is more unstable in comparison to single bond compounds. Unsaturated fats, having double bonds in their structures are more reactive than saturated fats.

5. In the context of stem cells, consider the following statements:

1. They are found only in multicellular organism.
2. They can be taken from umbilical cord blood just after birth.

Which of the above statements is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Answer: (C)

Explanation: Stem cells are undifferentiated biological cells that can differentiate into specialized cells and can divide (through mitosis) to produce more stem cells. They are found in multicellular organisms. In mammals, there are two broad types of stem cells: embryonic stem cells, which are isolated from the inner cell mass of blastocysts, and adult stem cells, which are found in various tissues. Stem cells can also be taken from umbilical cord blood just after birth.