Which of the following statements are correct about metals? (a) Metals are lustrous. (b) These are good conductors of heat and electricity. (c) They can be converted into wire. (d) They are malleable. Choose the correct option: A. Both (a) and (d) B. Both (a) and (c) C. Both (c) and (d) D. All (a). (b), (c) and (d)

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Question:- A mixture of salt and sugar is known as A. Homogeneous mixture B. Heterogeneous mixture C. Mixture of Components D. None of the above

Answer:- Ans. B Explanation: A mixture in which its components do not mix with each other and the distribution of components in different parts of the mixture is not uniform is called heterogeneous mixture.

Question:- By which process can sea water be purified? A. Evaporation B. Fractional Distillation C. Filtration D. Distillation

Answer:- Ans. D Explanation: Distillation is a procedure by which two liquids with different boiling points can be separated or it is a process in which the components of a substance or liquid mixture are separated by heating it to a certain temperature and condensing the resulting vapours.

Question:- Which technology is used to squeeze water from the soaked clothes in the washing machine? A. Evaporation B. Decantation C. Centrifugation D. Sedimentation

Answer:- Ans. C Explanation: When the particles present in the fluid are so small that they crosses the pores of the filter sheet, so these particles are not separated by filter method. When these mixtures are rotated quickly, heavy particles sit down and the light particles remain above. This is centrifugation technique or we can say that Centrifugation is a technique used for the separation of particles from a solution according to their size, shape, density, viscosity of the medium and rotor speed.

Question:- Due to which process dry raisins when kept in water swell up? A. Osmosis B. Sedimentation C. Distillation D. Decantation

Answer:- Ans. A Explanation: A process by which molecules of a solvent tend to pass through a semi-permeable membrane from a less concentrated solution into a more concentrated one is known as osmosis.

Question:- Which of the following is a mixture? A. Distilled water B. Gasoline C. Both A and B D. Neither A nor B

Answer:- Ans. B Explanation: Two or more elements or compounds when mixed in any proportion so that the chemical properties of the components do not change, then it is called a mixture.

Question:- Boyles law relates to which state of matter? A. Solid state B. Liquid stage C. Gaseous state D. None of the above

Answer:- Ans. C Explanation: Boyles law, the pressure of certain quantities of gas on stable heat is inversely proportional to its volume.

Question:- Which mission of NASA brought first human to moon? A. Apollo program B. Gemini Program C. Mercury Program D. None of the above

Answer:- A

Question:- Name the first mission of NASA in which a spacecraft was reused? A. Apollo-Soyuz B. Space Shuttle C. Skylab D. None of the above

Answer:- B

Question:- How many manned space missions are launched by NASA so far? A. 160 B. 162 C. 164 D. 166

Answer:- D

Question:- Name the first Spacecraft to visit the Solar System? A. Pioneer 10 and Pioneer 11 B. Ranger 1 and Ranger 2 C. Surveyor 6 and Surveyor 7 D. Viking 1 and Viking 2

Answer:- A

Question:- What was the first manned mission of NASA? A. PQS-5 B. Apollo-Soyuz C. STS-1 D. Bell X-1

Answer:- C

Question:- Name the NASA’s first exploration mission beyond earth? A. Pioneer 2 B. Pioneer 3 C. Pioneer 4 D. Pioneer P-1

Answer:- C

Question:- When NASA had launched its first mission to Sun? A. 2016 B. 2017 C. 2018 D. None of the above

Answer:- C

Question:- What is the goal of the Surveyor Program of NASA? A. To demonstrate the proper landing on the Mars. B. To demonstrate the soft landings on the Moon. C. To check other missions of Apollo. D. To determine the radiations in Space.

Answer:- B