Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb85f59b460d7261ec4f.JPG' /> In the above figure, 2 is ____ in colour.

Question 4 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbdcf59b460d7261ecb9.jpg' /> A person takes a torch covers its glass with a chart paper which has three narrow slits as shown in Figure above. He spreads a sheet of chart paper on a smooth wooden board and fixes a plane mirror strip vertically on the chart paper. Now, he directs the beam of light on the mirror from the torch with slits. He places the torch in such a way that its light is seen along the chart paper on the board. Now, he adjusts its position so that the light from the torch strikes the plane mirror at an angle. Does the mirror change the direction of light that falls on it?

Question 5 :
Rectilinear propagation of light means that beam of light always travels in ______ line.

Question 6 :
We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)

Question 7 :
Image will be virtual, erect and of same size as object in ________ mirror.

Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb54f59b460d7261ec1c.PNG' /> Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in figure. The current flowing in both the circuits is the same. Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.

Question 12 :
When an electric current flows through a wire, it behaves like a magnet. State true or false .

Question 13 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd6f59b460d7261ecb1.jpg' /> As shown in the above figure , Zubeda made an electric circuit using a cell holder, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit .

Question 14 :
True or False. If a large current passes through a wire, the wire may become so hot that it may even melt and break.

Question 15 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd0f59b460d7261eca9.jpg' /> A person takes around 75 cm long piece of insulated (plastic or cloth covered or enamelled) flexible wire and an iron nail, say about 6–10 cm long. He winds the wire tightly around the nail in the form of a coil. Now, he connects the free ends of the wire to the terminals of a cell through a switch as shown in above figure. Next, he places some pins on or near the end of the nail. Now, he switches on the current. He switches off the current. Are the pins still clinging to the end of the nail?

Question 16 :
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks.

Question 17 :
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Question 21 :
What precautions would you take to provide protection against lightning ?

Question 25 :
_____________is a dark funnel shaped cloud that reaches from sky to earth.

Question 26 :
Why is Chandigarh unlikely to be affected by a cyclone ?

Question 29 :
The main cause of wind movement is uneven_______ on the earth.