Science Class 8th
371. Refractor telescope uses _____
A) Mirror
B) Light
C) Lens
D) Convex
372. Reflector telescope uses _____
A) Mirror
B) Lens
C) Light
D) Dark
373. The _____ collect the radio signals from space and focuses them on the antenna.
A) Dish
B) Mirror
C) Lens
D) None of the above
374. Many changes occur around us all the time. They may be __________.
A) Physical
B) Chemical
C) Both A and B
D) None of the above
375. Which of the following is an example of chemical reaction:
A) Digestion of Food
B) Process of Respiration
C) Replication of DNA
D) All of the above
376. The reaction can be determined by the following, except which of the following:
A) Change in the color
B) Increase of Mass
C) Release of Gas
D) Emission of light
377. A chemical reaction occurs when two or more simpler substances combine and entire new substances are formed.
A) True
B) False
378. Elements taking part in the chemical reaction are called as:
A) Products
B) Electrolyte
C) Reactants
D) Catalysts
379. The compound that is formed by the reaction is called as:
A) Product
B) Reactants
C) Result
D) Catalyst