Two clocks are shown. After how much time will the first clock show the time as in the second clock?

4 hours

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16 hours

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Both A and B

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None of the above

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Solution

The correct option is C Both A and B
Time shown by the first clock = 09:00
Time shown by the second clock = 01:00
Time difference between the two clocks = Time difference between 09:00 and 12:00 + Time difference between 12:00 and 01:00 = 3 + 1
= 4 hours
Now, we know that the clock shows the same time after every 12 hours.
The second time when the first clock will show 1 O' clock = 4 + 12
= 16 hours
So, both options A and B are correct.

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Question 2

Two clocks A and B are shown in the Figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks?

(a) Time interval of 30 seconds can be measured by clock A

(b) Time interval of 30 seconds cannot be measured by clock B

(d) Time interval of 4 minutes 10 seconds can be measured by clock A

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Q. A seconds pendulum clock has a steel wire. The clock shows correct time at

25^{0} C

. How much time does the clock loose or gain, in one week, when the temperature is increased to

35^{0} C

?
(

α s t e e l = 1.2 \times 10^{- 5} /^{0} C

)

Q. A seconds pendulum clock has a steel wire. The clock shows correct time at

25^{\circ} C

. How much time does the clock lose or gain in one week, when the temperature is increased to

35^{\circ} C

(α_{s t e e l} = 1.2 \times 10^{- 5} /^{\circ} C)

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