Subject :NSO Class : Class 5
Three metals P, Q and R show different expansion properties when heated. The metal P expands less than Q and metal Q expands less than R.
Aditi has made a circuit for a fire alarm in which she wants to use a bimetallic strip to cause completion of the circuit (shown in figure) so that the alarm bell
can ring.
Which of the following bimetallic strips should she
use at place X?
A
B
C
D
pls expiain
Ans 1:
Class : Class 6
a
Ans 2:
Class : Class 6
a
Ans 3:
Class : Class 8
Ans 4:
Class : Class 8
Metal P expands less then Q and metal Q expands less than R. So, metal P expands less than R. If a bimetallic strip is heated it bends with metal which expands more on the outside and the metal which expands less in the inside. So the strip should bend downwards to complete the circuit for the bell to ring.Answer- A.
Ans 5:
Class : Class 9
Ans 6:
Class : Class 4
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