The fire-fighting team reached the venue quickly and extinguished the fire, _________ saving many lives.
(a) therefore
(b) hence
(c) thereby
(d) then

Rajan constructed a small house. He used good quality and well insulated copper wires for wiring. He also used good quality switches, sockets and plugs. However, had a very old room heater. On one winter night, Rajan was sleeping in a closed room with his family with the room heater switched on. During sleep, Rajan felt suffocated and woke up to see the room heater on fire. Rajan's son Arvind got up quickly and put off the main switch. Arvind also made a telephone call to Fire Brigade. The Fire Brigade men reached quickly and extinguished fire in the room. Rajan and his family thanked the firemen. (a) What was the cause of fire in Rajan's house ? (b) Name the safety device which was missing in the electric wiring of Rajan's house ? (c) How could the above device prevent fire in Rajan's house ? (d) What values are displayed by Arvind in this whole incident ?

In the given sentence, identify the segment which contains the grammatical error. I was reading the newspaper when I heard the sound of bullets been fired. (a) when i heard (b) the sound of bullets (c) been fired (d) I was reading the newspaper

Mr. Dogra lives in a very old house. The electric wiring in this house was done more than 50 years ago. Mr. Dogra purchased an air conditioner recently. One day Mr. Dogra was sitting in a closed room with all his family members with air conditioner switched on. A geyser was also working on the same socket as the air conditioner. Suddenly, everyone in the room heard a little explosion and saw that the electric wires in the air conditioner socket had caught fire. Mr. Dogra was so shocked that he did not know what to do. Mr. Dogra's son Rajesh who is studying in Class X rushed out of the room and put off the main switch quickly. Before Mr. Dogra could call the Fire Brigade, Rajesh extinguished the fire with the help of a fire extinguisher which he had made in the school. An electrician was called. When he checked the main fuse, he found that someone had put a thick copper wire in the main fuse instead of proper fuse wire. The electrician changed the whole wiring of the house by using good quality wires and fixed a proper fuse wire in the main fuse. He also made separate circuit for geyser and provided separate fuses for all the circuits. (a) Why did the electric wires catch fire ? (b) What is the condition of using an air conditioner and a geyser on the same socket known as ? (c) Why did the fuse not blow off ? (d) What would you recommend in place of old porcelain fuse holders in the house to project the wiring more efficiently ? (e) What values are displayed by Mr. Dogra's son Rajesh in this whole episode ?