Class -7th GK Questions and answer Unit -3

 Unit- 3 Environment And The World of Science 

Topic :-    Measuring Devices 

Q.1    Which device is used for measuring electric current ? 

Ans:- Ammeter 

Q.2       Name the device which is used for measuring depth of an ocean ? 

Ans:-    Fathometer

Q.3    Which instrument is used for measuring seismic waves ?

Ans:-    Seismometer 

Q.4    Which device is used for measuring distance travelled ? 

Ans:-    Odometer 

Topic :-  Health in Your Hands 

Q.1    _________help our body to grow and build muscles .

Ans:-    Minerals 

Q.2       _________helps in maintaining a good vision and healthy skin .

Ans:-    Vitamin A 

Q.3       Which vitamin is essential for the good health of bones ? 

Ans:-   Vitamin D 

Q.4    ________helps our body to grow and build muscles .

 Ans:-    Proteins

Topic :- Medical Pioneers 

Q.1    Who developed the first vaccine for smallpox ? 

Ans:-   Edward Jenner discovered the first smallpox vaccine in 1796.

Q.2        Which lady is known as "Lady With the Lamp" ? 

Ans:-    Florence Nightingale 

Q.3    Which Doctor is known for world's first human to human heart transplant in 1967? 

Ans:-      Dr. Christiaan Barnard   

Q.4    Which virologist received the Nobel Prize in Physiology for the discovery of HIV? 

Ans:-    Francoise Barre-Sinoussi ( South Africa) 

Topic :-     Science Trivia 

Q.1    Which planet orbits a star other than the sun ? 

Ans:-     Exoplanet 

Q.2    What does a massive star become when it dies ? 

Ans:-    Black Hole 

Q.3    The only common metal that is liquid at room temperature . 

Ans:-    Mercury 

Q.4    The amount of water vapour in the air at any given time . 

Ans:-    Humidity 

Q.5    ________is a highly flammable gaseous fuel which is extracted from petroleum .

Ans:-    Butane . 

Topic :- Source of Energy 

Q.1    What do you understand by Renewable sources of energy ? 

Ans:-     Renewable sources of energy refer to those natural resources which can be replaced at the same rate at which they are being consumed . 

Q.2 What do you understand by Non-renewable sources of energy ?

Ans:-   It is refer to the natural resources which cannot be replaced at the same rate at which they are being consumed . 

Q.3         Name any two Non-renewable sources . 

Ans:-     1. Coal     2. Petrol 

Q.4     Name any two renewable sources.

Ans:-    1. Water         2. Sunlight