UPPSC Prelims 2025: Previous-Year Questions

Consider the following elements found in a typical 70 kg man and arrange them in correct increasing order.
1. Sodium 2. Potassium 3. Copper 4. Iron Select the correct answer from the code given below:

Which of the following enzymes is/are released in stomach for protein digestion?
1. Chymotrypsin 2. Trypsin 3. Pepsin Select the correct answer using the code given below:

Which of the following statements with reference to 'blood' is/are correct?
1. Blood is composed of plasma and different types of cells.
2. The presence of haemoglobin makes blood appear red. Select the correct answer from the code given below:

Which of the following statements is/are correct?
1. Dolphins and Whales breathe through blowholes.
2. Earthworm breathe through their skin. Select the correct answer from the code given below:

With reference to 'Ecosystem', which of the following statements is/are correct?
1. Green plants in terrestrial ecosystem capture about 1% of energy of the sunlight that falls on their leaves.
2. Around 10% of organic matter reaches to the next higher level of consumers. Select the correct answer from the code given below:

With reference to lichens, which of the following statements is/are correct?
1. Lichens are very good indicators of pollution.
2. Lichens grow well in polluted areas. Select the correct answer from the code given below:

With reference to 'Isotopes', which of the following statements is/are correct?
1. Atoms with identical atomic numbers but different atomic mass numbers are known as isotopes.
2. Protium, Deuterium and Tritium are isotopes of carbon.
Select the correct answer from the code given below:

Which of the following gases is/are lighter than air?
1. Hydrogen chloride
2. Sulfur dioxide
3. Helium
Select the correct answer from the code given below:

With reference to 'acid and bases', which of the following statements is/are correct?
1. Acidic solutions have pH more than 7.
2. Basic solutions have pH less than 7.
Select the correct answer from the code given below:

Which of the following pairs is/are NOT correctly matched? (Acid) (Acid found in)
1. Lactic acid — Curd
2. Tartaric acid — Grapes
3. Acetic acid — Potato
Select the correct answer from the code given below:

Which of the following two are the major constituent of Bio-gas?
1. Methane
2. Butane
3. Carbon dioxide
4. Carbon monoxide
Select the correct answer from the code given below:

With reference to 'Baking Soda', which of the following statements is/are correct?
1. It is Sodium hydrogen carbonate.
2. It is used in fire extinguishers.
Select the correct answer from the code given below:

With reference to 'Silver articles', which of the following statements is/are correct?
1. Silver articles turn black after some time when exposed to air.
2. It happens due to coating of silver sulphide.
Select the correct answer from the code given below:

Assertion (A): Evaporation of sweat from human skin dissipates body heat. Reason (R): High humidity on a hot day increases discomfort.

Arrange the following electromagnetic radiations in decreasing order of their frequencies:

• 1. Gamma rays
• 2. Ultraviolet rays
• 3. Radio waves
• 4. X-rays

Assertion (A): Voices of men and women are different. Reason (R): Length and thickness of vocal cord is different in men and women.

Assertion (A): Generally an alloy of lead and tin is used as a material of the fuse wire. Reason (R): Alloy of lead and tin has a higher melting point than copper and aluminium.