Question 4 :
State True or False. Coal is one of the fuels used to cook food.
Question 5 :
State True or False. CNG is less polluting fuel than petrol and diesel.
Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d061f59b460d7261f2dd.png ' />
From the above image,match the items given in Column I with the items of Column II.
Question 8 :
State True or False. Petroleum, coal and natural gas are fossil fuels.
Question 10 :
State True or False. It is difficult to transport natural gas through pipes.
Question 11 :
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its __________
Question 14 :
The lowest temperature at which a substance catches fire is called its __________ temperature.
Question 18 :
The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer, why?
Question 19 :
Is it True or false that greater the calorific value, better is the fuel?
Question 28 :
In leaves, name the pigment that is responsible for green colour
Question 29 :
The cytoplasm and nucleus are enclosed within the cell membrane, also called ____________.
Question 34 :
Is it TRUE OR FALSE, Coal can be drawn into wires?
Question 36 :
Some metals react with water to produce metal hydroxides and hydrogen gas. Generally, nonmetals do not react with water.
Question 38 :
Is it TRUE OR FALSE, Sodium is a very reactive metal?
Question 40 :
What is the sequence of metals from more reactive to less reactive among zinc, iron and copper?
Question 44 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0eff59b460d7261f391.png' />
From the above image, fill in the crossword puzzle using the following hint: Protuding voice box in boys
Question 45 :
Choose the correct word for the given clue. Clue - Pancreatic hormone
Question 46 :
Choose the correct word for the given clue. Clue - Glands without ducts.
Question 47 :
Name the female hormone produced by ovaries that helps in development of mammary glands.
Question 49 :
Out of the following, which is the correct match for Pancreatic hormone
Question 50 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0ebf59b460d7261f38c.png' />
From the above image, fill in the crossword puzzle using the following hint: Secretion of endocrine glands