Competetivite Examination Important Science MCQ
1. A person is hurt on kicking a stone due to-(A) Velocity
(B) Inertia
(C) Reaction
(D) Momentum
Ans- C
2. The book "La Balancitta" was written by-
(A) Sir Issac Newton
(B) Archimedes
(C) Galileo Galilei
(D) E. Rutherford
Ans- C
3. The fuse in our domestic electric circuit melts when there is a high rise in-
(A) Conductivity
(B) Capacitance
(C) Resistance
(D) Current
Ans- D
4. The value of Universal Gravitation constant was first found by-
(A) Sir Issac Newton
(B) Henry Cavendish
(C) Galileo Galilei
(D) Sir J. J. Thomson
Ans- B
5. Which of the following is an example for cantilever beam?
(A) Diving board
(B) Bridge
(C) See-saw
(D) Common balance
Ans- A
6. The value of gravitational acceleration at surface of earth is-
(A) 2.1 meter/square second
(B) 6.8 meter/square second
(C) 9.8 meter/square second
(D) Zero
Ans- C
7. It is difficult to cook rice-
(A) At the top of a mountain
(B) At Sea level
(C) Under a mine
(D) None of these
Ans- A
8. The ratio of the weight of an object on surface of earth and moon is-
(A) 1/2
(B) 1/4
(C) 1/6
(D) 1/8
Ans- C
9. The instrument used to see the distant objects on the Earth is-
(A) Terrestrial telescope
(B) Astronomical telescope
(C) Compound microscope
(D) Simple microscope
Ans- A
10. A dynamo is a device which-
(A) Converts mechanical energy into heat
(B) Coverts electrical energy into heat
(C) Converts mechanical energy into electrical energy
(D) Converts electrical energy into mechanical energy
Ans- C
Important science Questions for UPSC & other PSC competitive exams
1. The elements which are liquid at room temperature-A. Mercury & Gallium
B. Mercury & Cesium
C. Mercury & Bromine
D. Mercury & Sodium
Ans: C
2. The substance such as metals from which wires can be drawn are called-
A. Mallable
B. Ductile
C. Sonorous
D. Brittle
Ans: B
3. The substances which can be hammered into thin sheet, are known as-
A. Mallable
B. Ductile
C. Sonorous
D. Brittle
Ans: A
4. The only metal which is liquid at room temperature-
A. Bromine
B. Gallium
C. Mercury
D. Cesium
Ans: C
5. Which one is not a chemical change?
A. Rusting of almirah
B. Electrolysis of water
C. Burning of fuel
D. Melting of butter
Ans: D
6. Which one is known as quick lime?
A. Calcium Oxide
B. Calcium Hydroxide
C. Calcium Carbonate
D. Calcium Chloride
Ans: A
7. Which one is known as baking powder?
A. Sodium Oxide
B. Sodium Hydroxide
C. Sodium Carbonate
D. Sodium Bicarbonate
Ans: D
8. Alpha particle scattering by gold leaf experiment resulted the invention of-
A. Electron
B. Neutron
C. Proton
D. Nucleus
Ans: D
9. Which one is not a sub atomic particle?
A. Electron
B. Neutron
C. Proton
D. Photon
Ans: D
10. Credit for the discovery of proton goes to-
A. Newton
B. Goldstien
C. Rutherford
D. Thomson
Ans: B
Science General Knowledge-
What is dry ice & what are its uses?
Dry ice is the solid form of carbon dioxide. It is also called as " Cardice " or as " card ice ".At temperatures below −56.4 °C (−69.5 °F) and at below 5.13 atm pressure (the triple point ), carbon dioxide gas changes from a solid to a gas with not converting into liquid, through a process called sublimation.
Uses of Dry Ice-
*. Dry ice is used primarily as a cooling agent. It is useful for preserving frozen foods, ice cream, etc., where mechanical cooling is unavailable.
*. To remove floor tiles.
*. To remove skin imperfections.
*. In the poultry industry.
*. To lengthen the life of wet ice.
*. To make fog in the entertainment industry.
*. To shrink metal.
*. To retard chemical catalysts.
*. As a mosquito attractant for traps.
*. By airline caterers to keep food chilled.
*. By blood banks for shipping the blood.
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