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π PHYSICS quiz
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1. When the speed of a car is doubled, then what will be the braking force to stop it in the same distance?
Ans. four times
2. If the diameter of a capillary is doubled, what will be the uptake of water inside it?
Ans. half
3. When a metal ring or rings is heated, what happens to its holes?
Ans. It spreads
4. Why does an iron needle kept lightly on the surface of water keep floating on it?
Ans. because of its surface tension
5. A boat will sink if it diverts water from its-
Ans. equal to weight
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βββββββββββββ
1. When the speed of a car is doubled, then what will be the braking force to stop it in the same distance?
Ans. four times
2. If the diameter of a capillary is doubled, what will be the uptake of water inside it?
Ans. half
3. When a metal ring or rings is heated, what happens to its holes?
Ans. It spreads
4. Why does an iron needle kept lightly on the surface of water keep floating on it?
Ans. because of its surface tension
5. A boat will sink if it diverts water from its-
Ans. equal to weight
To get all questions start this bot and register without only 100 birr
@ElevateTutor_bot
Chemistry questions
1. What is the chemical formula for water?
a) H2O2
b) HO
c) H2O
d) H3O
2. Which of the following is an example of a chemical change?
a) Melting ice
b) Boiling water
c) Burning wood
d) Dissolving salt in water
3. What is the atomic number of an element?
a) The number of neutrons
b) The number of protons
c) The number of electrons
d) The number of neutrons and protons combined
4. Which of the following is a noble gas?
a) Oxygen
b) Hydrogen
c) Nitrogen
d) Helium
5. What is the name for the chemical bond formed by sharing electrons?
a) Ionic bond
b) Metallic bond
c) Covalent bond
d) Hydrogen bond
6. Which of the following is an acid?
a) NaCl (table salt)
b) NaOH (sodium hydroxide)
c) HCl (hydrochloric acid)
d) H2O (water)
7. What is the process by which a solid changes directly into a gas?
a) Melting
b) Sublimation
c) Vaporization
d) Condensation
8. Which of the following is a base?
a) H2SO4 (sulfuric acid)
b) HNO3 (nitric acid)
c) NH3 (ammonia)
d) CH3COOH (acetic acid)
9. What is the term for a substance that speeds up a chemical reaction?
a) Inhibitor
b) Catalyst
c) Reactant
d) Product
10. What is the number of moles of solute present in 1 Liter of solution called?
a) Molarity
b) Molality
c) Mole fraction
d) Percent by volume
11. Which of the following is an example of a physical property?
a) Reactivity
b) Flammability
c) Density
d) Toxicity
12. What is the name for the smallest particle of an element that can exist?
a) molecule
b) compound
c) atom
d) ion
13. Which of the following is an example of a homogeneous mixture?
a) Pizza
b) Sand and water
c) Air
d) Salad
14. What is the term for the energy required to start a chemical reaction?
a) Enthalpy
b) Activation energy
c) Gibbs free energy
d) Bond energy
15. Which of the following is the balanced equation for the combustion of methane (CH4)?
a) CH4 + O2 β CO2 + H2O
b) CH4 + 2O2 β CO2 + 2H2O
c) 2CH4 + O2 β 2CO2 + H2O
d) CH4 + O2 β 2CO2 + H2O
1. What is the chemical formula for water?
a) H2O2
b) HO
c) H2O
d) H3O
2. Which of the following is an example of a chemical change?
a) Melting ice
b) Boiling water
c) Burning wood
d) Dissolving salt in water
3. What is the atomic number of an element?
a) The number of neutrons
b) The number of protons
c) The number of electrons
d) The number of neutrons and protons combined
4. Which of the following is a noble gas?
a) Oxygen
b) Hydrogen
c) Nitrogen
d) Helium
5. What is the name for the chemical bond formed by sharing electrons?
a) Ionic bond
b) Metallic bond
c) Covalent bond
d) Hydrogen bond
6. Which of the following is an acid?
a) NaCl (table salt)
b) NaOH (sodium hydroxide)
c) HCl (hydrochloric acid)
d) H2O (water)
7. What is the process by which a solid changes directly into a gas?
a) Melting
b) Sublimation
c) Vaporization
d) Condensation
8. Which of the following is a base?
a) H2SO4 (sulfuric acid)
b) HNO3 (nitric acid)
c) NH3 (ammonia)
d) CH3COOH (acetic acid)
9. What is the term for a substance that speeds up a chemical reaction?
a) Inhibitor
b) Catalyst
c) Reactant
d) Product
10. What is the number of moles of solute present in 1 Liter of solution called?
a) Molarity
b) Molality
c) Mole fraction
d) Percent by volume
11. Which of the following is an example of a physical property?
a) Reactivity
b) Flammability
c) Density
d) Toxicity
12. What is the name for the smallest particle of an element that can exist?
a) molecule
b) compound
c) atom
d) ion
13. Which of the following is an example of a homogeneous mixture?
a) Pizza
b) Sand and water
c) Air
d) Salad
14. What is the term for the energy required to start a chemical reaction?
a) Enthalpy
b) Activation energy
c) Gibbs free energy
d) Bond energy
15. Which of the following is the balanced equation for the combustion of methane (CH4)?
a) CH4 + O2 β CO2 + H2O
b) CH4 + 2O2 β CO2 + 2H2O
c) 2CH4 + O2 β 2CO2 + H2O
d) CH4 + O2 β 2CO2 + H2O
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