science quizz class 10

1.In the reaction 2HCl + Na₂CO₃ → …, what are the products?

• A) NaCl + H₂O

• B) NaCl + H₂O + CO₂
  

• C) NaCl + CO₂ + H₂

• D) NaCl + H₂ + O₂
  

2.Which is NOT a characteristic of an acid?

• A) Sour taste

• B) Turns blue litmus red

• C) Reacts with a base to form salt + water
  

• D) pH greater than 7
  

3.What is the chemical symbol for sodium?

• A) S
  

• 
  B) Na

• C) So
  

• 
  D) N

4. 4.Chemical formula for baking soda is

• A)Nacl

• B) NaHCO₃

• C) Na₂CO₃

• D) NaOH

5.Which process releases energy from food in living organisms?

• A) Respiration
  

• B) Photosynthesis
  

• C) Digestion
  

• D) Transpiration
  

6.Where does fertilization occur in humans?

• A) Ovary
  

• B) Uterus
  

• C) Fallopian tube

• D) Vagina
  

7.Which is a heritable trait?

• A) Musical ability
  

• B) Bicycle riding
  

• C) Eye color
  

• D) Learned behavior
  

8.The change in frequency or wavelength of a wave passing between media is called:

• A) Diffraction
  

• B) Reflection
  

• C) Refraction
  

• D) Interference
  

9.Ability of the eye to see objects at different distances is called:

• A) Accommodation
  

• B) Refraction
  

• C) Reflection
  

• D) Dispersion
  

10.Material that allows electric current to pass easily:

• A) Conductor
  

• B) Insulator
  

• C) Semiconductor
  

• D) Diode