A person has two hourglasses, one of $30 s e c o n d s$ and the other of $1 m i n u t e$ . Which of the following time intervals can he not measure?

30 s e c o n d s

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60 s e c o n d s

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50 s e c o n d s

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90 s e c o n d s

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Solution

The correct option is C $50 s e c o n d s$
He can measure the time in multiple of $30$ and $60$ but $50$ is not a multiple of either $30$ or $60$ .
Hence $50$ seconds can't be measured by him.

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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

Q. Which of the following is not a measure to express time interval?

Q. Which of these can only measure time interval and not the time of day?

(a) sand clock
(b) sundial
(c) pendulum clock
(d) quartz clock

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A person has two hourglasses, one of 30 seconds and the other of 1 minute. Which of the following time intervals can he not measure?

The correct option is C 50 secondsHe can measure the time in multiple of 30 and 60 but 50 is not a multiple of either 30 or 60.Hence 50 seconds can't be measured by him.

A person has two hourglasses, one of $30 s e c o n d s$ and the other of $1 m i n u t e$ . Which of the following time intervals can he not measure?

The correct option is C $50 s e c o n d s$
He can measure the time in multiple of $30$ and $60$ but $50$ is not a multiple of either $30$ or $60$ .
Hence $50$ seconds can't be measured by him.