Chapter Wise General Science Mcq’s with Explanation
Today’s Topic: Physic Mechanics
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Tuesday- General Science
Wednesday- Indian Polity and Governance
Thursday- History of India and Indian National Movement
Friday- Economic and Social Development
Saturday-Indian and world Geography
Today’s Topic: Physic Mechanics
Q1. Match the following :
- Photoelectric effect X. Tesla
- Magnetic field Y. Eienstein
- Electric press Z. Henry Becquarle
- Radioactivity P. Henry Sheile
Choose the correct option:
a) A-Y, B-X, C-P, D-Z, b) A-X, B-Y, C-P, D-Z,
c) A-Z, B-X, C-Z, D-P, d) A-X, B-Y, C-Z, D-P.
Photoelectric effect – Einstein
Magnetic field – Tesla
Electric Press – Henry Shellie
Henry Becquerel – Radioactivity
Q2. Food cans are coated with tin not with zinc because:
a) Zinc is costlier than tin
b) Zinc has the higher melting point than tin
c) Zinc is more reactive than tin
d) Zinc is less reactive than tin.
Explanation: In the metal activity series the position of zinc is above in comparison to tin i.e. zinc is more reactive. Tin can process was allegedly developed by Frenchman Philippe de Girard. Food cans are still mostly made from the tin plate using a three-piece construction. Although tin is corrosion resistant, acidic food like fruits and vegetables can cause corrosion of the tin layer causing Nausea, Vomiting and Diarrhoea.
Q3. While Cooking, if the bottom of the vessel is blackened on the outside, it means that:
a) The food is not cooked completely.
b) The fuel is not burning completely.
c) The fuel is wet.
d) The fuel is burning completely.
Explanation: Bottom of the vessel is blackened due to incomplete combustion of fuel. It happens due to air holes are blocked and proper oxygen is not supplied. For cooking food we must use thick pot bottoms because it distributes heat better because the heat spreads in a uniform manner. When the bottom of the pot is too thin, the heat of the flame immediately penetrates in that the spot, possibly resulting in burnt or blackened.
Q4. Which one of the following has high calorific value:
a) Hydrogen b) Coal c) Natural gas d) Gasoline
Explanation: Calorific values of above fuels is as follows:
Hydrogen – 150
Coal – 33
Natural Gas – 33.50
Gasoline – 50
Calorific value – The calories of thermal units contained in one unit of a substance and released when the substance is burned.
Caloric values of Fuels (kcal/kg)
Coal – 4000-7000
Carbon – 8000
Petrol – 10800
Biogas – 4700-6000
Q5. Consider the following statement about the Jet engine and a rocket:
1) A Jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space.
2) A rocket carries its own supply of oxygen in the gas form and fuel.
a) 2 only b) 1 only c) Both 1 and 2 d) Neither 1 nor 2.
Explanation: The fuel used in rockets is called rocket fuel. A propellant is an explosive used to fire a projectile from gun. It is a combination of an oxidizer (like liquid hydrogen, liquid oxygen or nitric acid) and a fuel which when ignited undergoes combustion to release the large quantity of hot gases.
Q6. Consider the following statements:
1) The images produced by plane mirrors are always virtual.
2) Concave mirrors form always real images. `
3) Concave mirrors are of converging in nature.
4) A converging lens can produce virtual as well as real images.
Which of the above is/are true?
a) Only 3 b) 2 and 3 c) 1, 3 and 4 d) All of these.
Explanation: Plane mirror never form real images because never really converge. Concave mirrors form real as well as virtual image (When object is in between (P and F). Converging lens can produce virtual as well s real images.
Q7. Assertion (A): A quick collision between two bodies is more violent than a slow collision, even when the initial and final velocities are identical.
Reason(R): Impulsive force is greater in the first case.
a) A is true, but R is false.
b) A is false, but R is true
c) Both A and R are true and R is the correct explanation of A.
d) Both A and R are true and R is not the correct explanation of A.
Explanation: Impulse = Force X Time. For quick collision, time t is small so a greater amount of force is applied. For this reason, quick collision is more violent. Impulsive force is greater in a quick collision.
Q8. Which of the following is the basis for The Airy’s Theory of Isostasy:
a) Law of compensation b) Principle of uniform depth
c) Law of flotation d) Law of compensation.
Explanation: The law of flotation tells that a floating body displaces its own weight of the fluid. It is introduced by Archemedies. There must be a perfect balance between the cause and effect between the antecedent and consequence. The law of compensation keeps up the balance and establishes peace, Concord, equilibrium harmony and justice in nature.
Q9. Consider the following statements:
1) Salt water has the potential to pump pollutants from the ocean into coastal freshwater aquifers making wells and other water sources contaminated.
2) The major fraction of oil contaminating the marine water is because of oil spilling. Which of the above statements is/are correct?
a) Both 1 and 2 b) Only 1 c) Only 2 d) Neither 1 nor 2.
Explanation: Almost 90% of all floating materials in the ocean are plastic. It is one of the most harmful pollutants because it does not readily break down in environments. Salt water has the potential to pump pollutants from the ocean into coastal freshwater aquifers making wells and other water sources contaminated.
Q10. Who among the following scientists shared the Nobel prize in physics with his son:
a) Max Planck b) Max Weber c) Henry Fayol d) Henry Bragg.
Explanation: Sir William Henry Bragg and his son, Sir William Lawrence Bragg, both received the Nobel prize in physics in 1915. The Braggs is the first and only father/son team to has jointly received the Nobel Prize. William Lawrence Bragg was awarded the Nobel Prize at age of 25 and as of yet he is still the youngest ever laureate.
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