Science and Technology

Which of the following uses an analogue signal?

(i) Infra-red thermometer

(ii) Computer

(iii) Smart watch

(iv) Short wave radio receiver

Following table shows the four groups of animals. To which group does fish belong?

(i) W

(ii) X

(iii) Y

(iv) Z

Choose the correct conclusion based on the given fact and statements. Fact: Climate change refers to long-term variations in temperature and precipitation patterns. Statement 1: This can lead to rising sea levels due to melting of ice. Statement 2: It makes the Earth move farther away from the Sun every year.

(i) Fact & both statements are correct.

(ii) Fact is incorrect but both the statements are correct.

(iii) Fact and statement 1 are correct but statement 2 is incorrect.

(iv) Fact and statement 2 are correct but statement 1 is incorrect.

Which of the following statements is correct?

(i) Value of acceleration due to gravity decreases when we go higher from the surface of the Earth.

(ii) Value of acceleration due to gravity decreases when the height increases from the surface of the Earth.

(iii) Value of acceleration due to gravity is less at the polar regions than the equatorial region of the Earth.

(iv) Value of acceleration due to gravity is the most at the highest peak of the Earth.

In the given figure, what is the weight of an object in liquid?

(i) 5 N

(ii) 25 N

(iii) 30 N

(iv) 35 N

Study the given diagram and identify p and q.

(i) p - angle of refraction and q - critical angle.

(ii) p - critical angle and q - angle of reflection.

(iii) p - angle of incidence, q - angle of refraction.

(iv) p - critical angle and q - angle of refraction.

According to the Aufbau's principle, which of the following sequences is correct?

(i) 2s, 2p, 3p, 4s

(ii) 2p, 3s, 3p, 4s

(iii) 2p, 3s, 4s, 3p

(iv) 1s, 2p, 2s, 3s

Which of the following equation is correct for the chemical reaction while burning magnesium with nitrogen?

(i) Mg + N → MgN

(ii) Mg + N₂ → MgN₂

(iii) 3Mg + N₂ → Mg₃N₂

(iv) 6Mg + N₂ → 2Mg₃N₂

Which of the following is the main ore of iron?

(i) Argentite

(ii) Chalcopyrite

(iii) Siderite

(iv) Haematite

Study the following statement and arguments about soap. Statement: Soap is environment friendly. Argument 1: Soap is biodegradable, hence does not pollute environment. Argument 2: Soap gives scum in hard water and makes clothes and utensil clean.

(i) Statement and argument 1 are wrong but argument 2 is correct.

(ii) Statement and argument 2 are correct but argument 1 is wrong.

(iii) Statement and argument 2 are wrong but argument 1 is correct.

(iv) Statement and argument 1 are correct but argument 2 is wrong.