Question 2 :
State true or false. LPGs and CNGs give a lot of heat energy when burnt.

Question 6 :
Fill in the blank: A liquid fuel used in homes is __________.

Question 7 :
The other properties of the soil like nutrient content, texture etc., also change because of deforestation. TRUE OR FALSE ?

Question 9 :
Reflection from a smooth surface like that of a mirror is called ______ ?

Question 10 :
If the angle of incidence ray is given $30^{\circ}$, then what is the angle of reflection?

Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07cf59b460d7261f300.jpg' /> In the above figure, two mirrors A and B are placed at right angles to each other. A ray of light incident on mirror A at an angle of $25^\circ$ falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be

Question 13 :
Water contaminated with sewage may contain bacteria, viruses, fungi and parasites which cause diseases like-

Question 14 :
Which of the following is NOT a member of the solar system?

Question 15 :
State true or false. The planet nearest to us is Jupiter.

Question 16 :
The earthquake measuring ______ or more on Richter scale can cause severe damage to life and property.

Question 18 :
What precautions should be taken if you are outside the house during a earthquake?

Question 19 :
What precautions should be taken if you are Inside the house during a earthquake?

Question 21 :
Constellations were devised by ancient people to be able to recognise _____in the sky.

Question 22 :
_______satellites are used for forecasting weather, transmitting television and radio signals.