SCIENCE QUIZZES 🥇

✍ ( Important Formulas ) ✅

1. Work = force × distance

2. Energy = force × distance

3. Speed = distance / time

4. Velocity= displacement / time

5. Electric field = electrical force/charge

6. Force = force/area

7. Volume = length × width × height

8. Mass density = mass/volume

9. Acceleration =velocity / time

10. Power = work / time

11. Pressure = force / area

11. Momentum = mass × velocity

13. Area (A) = Length × Width

14. Force (F) = Mass × Acceleration

15. Pressure Energy = Pressure × Volume

16. Impulse = force × time

17. Linear momentum = mass × velocity

18. Kinetic energy = 1/2 mv²

19. Mechanical energy = kinetic energy + potential energy

20. Angular momentum = Inertial × Angular velocity

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✅ Some Important Questions Of Physics ✅

1. Why is it easier to burst a gas filled balloon with a needle than with a nail?
Ans. The needle exerts more pressure on the balloon than the nail.

2. The velocity of sound in wet air is greater than that of dry air because in moist air -
Ans. Density is less than that of dry air.

3. Why do we feel cool when we sit near the fan?
Ans. The air evaporates the sweat from our body.

4. At which place the force of gravity is greatest?
Ans. on pole line

5. It is difficult to hammer a nail into a freely hanging wooden structure. Which rule supports this statement?
Ans. Newton's third law

6. A soap bubble acquires a spherical shape due to -
Ans. surface tension

7. According to the second law of motion, acceleration for a given force is inversely proportional to the ……… of the object.
Ans. Mass

8. If the momentum of a body is doubled, the kinetic energy becomes ……….
Ans. four times

9. Kilowatt hour (kWh) is the unit of which of the following?
Ans. energy

10. Which one of the following properties of a proton does not change while moving freely in a magnetic field?
Ans. Speed

11. In what unit is noise measured?
Ans. Decibel

12. Under what condition is the easiest method to convert a gas into a liquid?
Ans. low temperature and high pressure

13. A mass of water is placed at 0°C. On heating to 10°C, its volume will be -
Ans. will increase after decrease

14. The temperature whose reading is equal on both the Fahrenheit and Celsius scale is -
Ans. –40°

15. On what does the pitch of sound depend?
Ans. frequency

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✅ PHYSICS ✅

1. Speed of light with increase in temperature of the medium?
Ans. stays the same

2. How does the Sun's heat reach the Earth?
Ans. by radiation

3. Which glass is used for sunglasses?
Ans. crooks glass

4. Which part of the sunlight heats the solar cooker?
Ans. infrared

5. The sky appears blue because of?
Ans. light scattering

6. Who was the first to measure the speed of light?
Ans. romer

7. Danger signals are usually red because red light -
Ans. It is least scattered and covers a greater distance and the intensity of light does not decrease due to scattering.

8. What is the atmospheric layer that reflects radio waves called?
Ans. ionosphere

9. Which instrument is used to study the dispersion of light?
Ans. spectrometer

10. The chemical formula of washing soda is-
Ans. Na2CO3.10H2O

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✅ (CHEMISTRY ) ✅

✅. Gases used in welding are ?
– Acetylene & Oxygen

✅ Gases used by sea divers for breathing are ?
– Oxygen & Helium

✅. Best sources for Vitamin D are?
– Sunlight & Fish liver

✅Zinc Phosphide is used as?
– Rat Poison

✅. Fuse wire is made up of
– Lead and Tin

✅Purest form of Iron is?
– Wrought Iron

✅ Radium is extracted from .
– Pitchblende

✅ Which agent is as ‘seed’ in artificial rain?
– Silver Iodide

✅. Oxides of metals are .
– Alkaline

✅ During the process of ‘rusting’ , the weight of iron .
–Increases

✅ (metal) is liquid at room temperature.
– Mercury

✅ What is the formula of common salt
– NaCl

✅. What is the maximum number of electrons that a p-orbital can hold
– 6

✅. What is used in fire extinguisher
– Sodium bicarbonate

✅ What is the nature of metal oxides
– Basic

✅. Which gas burns with popping sound
– Hydrogen

✅ Which metal is used for galvanization
– Zinc

✅. What is the nature of bleaching powder
– Oxidising agent

✅ Which is stored in Kerosene
– Sodium

✅ Phenolphthalein gives which color in acidic medium
– Colorless

✅ Which gas is used in cigarette lighters?
– Butane

✅. Biogas chiefly contains .
– Methane

✅. Chemical used as fixer in Photography is .
– Sodium thiosulphate

✅Aspirin is
– Acetyl Salicylic Acid

✅ is also known as ‘Stranger Gas.’
– Xenon

✅ Natural rubber is a polymer derived from .
– Isoprene

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