UPSC Insta–DART (Daily Aptitude and Reasoning Test) 27 Jan 2025

Considering the alarming importance of CSAT in UPSC CSE Prelims exam and with enormous requests we received recently, InsightsIAS has started Daily CSAT Test to ensure students practice CSAT Questions on a daily basis. Regular Practice would help one overcome the fear of CSAT too.We are naming this initiative as Insta– DART – Daily Aptitude and Reasoning Test. We hope you will be able to use DART to hit bull’s eye in CSAT paper and comfortably score 100+ even in the most difficult question paper that UPSC can give you in CSP-2021. Your peace of mind after every step of this exam is very important for us.

Looking forward to your enthusiastic participation (both in sending us questions and solving them on daily basis on this portal).

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• Question 1 of 5 1. Question Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : We feel comfortable in hot and humid climate. Reason (R) : Sweat evaporates faster in humid climate. 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) Both A and R are false. Correct Answer: D Explanation We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily. Incorrect Answer: D Explanation We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily.

#### 1. Question

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A) : We feel comfortable in hot and humid climate.

Reason (R) : Sweat evaporates faster in humid climate.

• 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) Both A and R are false.

Explanation

We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily.

Explanation

We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily.

• Question 2 of 5 2. Question Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (R): Alcohol rather than mercury is used in a thermometer to measure a temperature of 60oC. Reason (R): Alcohol has a lower freezing point than mercury. 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. Correct Answer: A Explanation Mercury freezes at – 39°C, while alcohol freezes at a point far below – 100o C. So, alcohol is used to measure lower temperatures. Similarly, mercury boils at 357oC, while alcohol boils at 78°C. So, mercury is used to measure high temperatures. Incorrect Answer: A Explanation Mercury freezes at – 39°C, while alcohol freezes at a point far below – 100o C. So, alcohol is used to measure lower temperatures. Similarly, mercury boils at 357oC, while alcohol boils at 78°C. So, mercury is used to measure high temperatures.

#### 2. Question

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (R): Alcohol rather than mercury is used in a thermometer to measure a temperature of 60oC.

Reason (R): Alcohol has a lower freezing point than mercury.

• 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.

Explanation

Mercury freezes at – 39°C, while alcohol freezes at a point far below – 100o C. So, alcohol is used to measure lower temperatures. Similarly, mercury boils at 357oC, while alcohol boils at 78°C. So, mercury is used to measure high temperatures.

Explanation

• Question 3 of 5 3. Question Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A): Pipes carrying water often burst in cold countries during severe winter. Reason (R): Water expands on freezing. 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. Correct Answer: A Explanation During severe winters, water in the pipes freezes to ice and expands, resulting in bursting of pipes. Incorrect Answer: A Explanation During severe winters, water in the pipes freezes to ice and expands, resulting in bursting of pipes.

#### 3. Question

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A): Pipes carrying water often burst in cold countries during severe winter.

Reason (R): Water expands on freezing.

• 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.

Explanation

During severe winters, water in the pipes freezes to ice and expands, resulting in bursting of pipes.

Explanation

During severe winters, water in the pipes freezes to ice and expands, resulting in bursting of pipes.

• Question 4 of 5 4. Question Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A): An electric bulb makes a ‘bang’ when it is broken. Reason (R): The air inside the bulb rushes out immediately on breaking. 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. Correct Answer: C Explanation There is a vacuum inside the electric bulb. When the bulb breaks, air rushes in at great speed from all sides to fill the vacuum, thus producing a ‘bang’. Incorrect Answer: C Explanation There is a vacuum inside the electric bulb. When the bulb breaks, air rushes in at great speed from all sides to fill the vacuum, thus producing a ‘bang’.

#### 4. Question

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A): An electric bulb makes a ‘bang’ when it is broken.

Reason (R): The air inside the bulb rushes out immediately on breaking.

• 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.

Explanation

There is a vacuum inside the electric bulb. When the bulb breaks, air rushes in at great speed from all sides to fill the vacuum, thus producing a ‘bang’.

Explanation

There is a vacuum inside the electric bulb. When the bulb breaks, air rushes in at great speed from all sides to fill the vacuum, thus producing a ‘bang’.

• Question 5 of 5 5. Question Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A): Salt is an ingredient used to cook food at higher altitudes. Reason (R): Temperature is lower at higher altitudes. 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. Correct Answer: B Explanation Due to decrease in pressure at higher altitudes, water boils much below 100oC so that the food does not get sufficient heat for being cooked. Salt increases the bed point of water. Incorrect Answer: B Explanation Due to decrease in pressure at higher altitudes, water boils much below 100oC so that the food does not get sufficient heat for being cooked. Salt increases the bed point of water.

#### 5. Question

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A): Salt is an ingredient used to cook food at higher altitudes.

Reason (R): Temperature is lower at higher altitudes.

• 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.

Explanation

Due to decrease in pressure at higher altitudes, water boils much below 100oC so that the food does not get sufficient heat for being cooked. Salt increases the bed point of water.

Explanation

Due to decrease in pressure at higher altitudes, water boils much below 100oC so that the food does not get sufficient heat for being cooked. Salt increases the bed point of water.

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