Subject :NSO Class : Class 4

Subject :NSO Class : Class 3

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Subject :NSO Class : Class 7

## Ans 1:

Class : Class 7

Hydrocloric acid is very corrosive and reacts with metals . So HCL is stored in glass bottles because it dont causes damage to it . ..........SO 3 statement should be true and their explanation is wrong .

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Subject :NSO Class : Class 7

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Subject :NSO Class : Class 5

## Ans 2:

Class : Class 6

Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

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Subject :NSO Class : Class 4

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Subject :NSO Class : Class 8

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Subject :NSO Class : Class 8

A 12 m long uniform bridge weighing 100000 N is being supported at the two ends. A lorry weighing
30000 N is parked at the 4 m mark as shown in the
figure. What are the forces acting on the bridge by
support A and support B respectively?

Support A | Support B | |

A | 70000 N | 60000 N |

B | 60000 N | 70000 N |

C | 65000 N | 65000 N |

D | 90000 N | 40000 N |

how ?

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Subject :NSO Class : Class 3

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Subject :NSO Class : Class 6

## Ans 3:

Class : Class 6

It should be T/21 only as T is the total time and no of times it passes Y is 21.Therefore the answer is T/21

## Ans 4:

Class : Class 8

it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10

## Ans 8:

Class : Class 6

throughout the time period or the 21 swings the pendulum will pass through the point Y 21 times. so the answer is B(t/21)

## Ans 9:

Class : Class 7

Yes it should be t/10 as the pendulum will pass through point y twice in its one revolution...... so the the time period should be t/10

## Ans 10:

Class : Class 8

it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10