Which of the following can neither be created nor be destroyed?

The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.

The 1980s saw the introduction

A-of the gas lighter that we

B-commonly use now, which has

C-almost destroyed the match industry

In a computer game, there are builders and destroyers. Together there are 20 of them. Some of them try to build a wall around a castle while the rest try to demolish it. Each of the builders can build the wall alone in 15 hours while any of the destroyers can demolish it in 10 hours. If all 20 builders and destroyers are made active when there is no wall and the wall gets built in 3 hours, how many of them are destroyers?

In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one, which best expresses the same sentence in Passive/Active voice.

The flood destroyed the whole town.

The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options.

P: The main manifestations of violence in recent times have been extremism, terrorism, assassination by bombs and bullets.
Q: In the modern world, violence has taken many forms, each signifying the evil side of man and his design to destroy the principle of equity, justice and truth.
R: Another related activity is the hijacking of aircrafts, vehicles etc.
S: A new dimension to the cult of violence has been added by the cult of kidnapping of innocent person and subsequent black mail.

Before a battle the ratio of tanks to planes in an army was 5 : 3. During the war 1000 tanks were destroyed and 800 planes were destroyed. The ratio of tanks to planes became 2 : 1. What is the number of tanks after the war.

In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/ passage and find out which of the four combinations is correct.

1. Making ropes is one of the oldest trades in the world.
P. People used them for tethering animals, for drawing water from wells and for dragging large stones which were used in building.
Q. We know that people made ropes several centuries back.
R. They made them from camel hair and from twisted grass.
S. We have found pieces of rope in very old Egyptian tombs.
6. We have found too, ropes which were made of thin copper wire in the city of Pompeii, which was destroyed by a volcano 2000 years ago.

In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one, which best expresses the same sentence in Passive/Active voice.

The storm destroyed several huts in the village.