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Question (31)

QN00301

The smallest interval of time measurable using a common wall clock shown in the chapter is

(A) 1 min
(B) 1 h
(C) 1 s
(D) 0.1 s

Correct Answer: C

Explanation:

A common wall clock measures time up to one second.

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Question (32)

QN00302

A speedometer in a vehicle measures

(A) distance travelled
(B) fuel used
(C) speed of vehicle
(D) time taken

Correct Answer: C

Explanation:

Speedometer displays speed in km/h.

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Question (33)

QN00303

An odometer measures

(A) acceleration
(B) distance travelled
(C) time period
(D) engine speed

Correct Answer: B

Explanation:

Odometer records total distance travelled.

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Question (34)

QN00304

The Ghatika-yantra measured one ghati in approximately

(A) 12 min
(B) 18 min
(C) 24 min
(D) 60 min

Correct Answer: C

Explanation:

One ghati was equal to about 24 minutes.

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Question (35)

QN00305

The world’s largest stone sundial Samrat Yantra is located in

(A) Delhi
(B) Jaipur
(C) Varanasi
(D) Ujjain

Correct Answer: B

Explanation:

Samrat Yantra is located at Jantar Mantar in Jaipur.

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Question (36)

QN00306

Samrat Yantra is important because it can measure time intervals as short as

(A) 1 minute
(B) 30 seconds
(C) 10 seconds
(D) 2 seconds

Correct Answer: D

Explanation:

The sundial can measure intervals as short as 2 seconds.

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Question (37)

QN00307

Modern atomic clocks are extremely accurate because they use

(A) pendulum oscillations
(B) water flow
(C) vibrations of specific atoms
(D) burning candles

Correct Answer: C

Explanation:

Atomic clocks use vibrations of atoms for accurate timekeeping.

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Question (38)

QN00308

A sprinter completes a 100 m race in 12.5 s. The speed of the sprinter is

(A) 6 m/s
(B) 7 m/s
(C) 8 m/s
(D) 9 m/s

Correct Answer: C

Explanation:

Speed = 100 ÷ 12.5 = 8 m/s.

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Question (39)

QN00309

A person walks 600 m in 10 minutes. Speed in m/s is

(A) 0.5 m/s
(B) 1 m/s
(C) 1.5 m/s
(D) 2 m/s

Correct Answer: B

Explanation:

10 min = 600 s, so speed = 600 ÷ 600 = 1 m/s.

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Question (40)

QN00310

Which statement is correct?

(A) Uniform motion is very common over long distances in daily life
(B) Average speed is total time divided by total distance
(C) Pendulum time period depends on bob mass only
(D) Average speed = total distance covered ÷ total time taken

Correct Answer: D

Explanation:

Average speed is calculated by dividing total distance by total time taken.

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Question (31)

The smallest interval of time measurable using a common wall clock shown in the chapter is

Explanation:

Link:

Question (32)

A speedometer in a vehicle measures

Explanation:

Link:

Question (33)

An odometer measures

Explanation:

Link:

Question (34)

The Ghatika-yantra measured one ghati in approximately

Explanation:

Link:

Question (35)

The world’s largest stone sundial Samrat Yantra is located in

Explanation:

Link:

Question (36)

Samrat Yantra is important because it can measure time intervals as short as

Explanation:

Link:

Question (37)

Modern atomic clocks are extremely accurate because they use

Explanation:

Link:

Question (38)

A sprinter completes a 100 m race in 12.5 s. The speed of the sprinter is

Explanation:

Link:

Question (39)

A person walks 600 m in 10 minutes. Speed in m/s is

Explanation:

Link:

Question (40)

Which statement is correct?

Explanation:

Link:

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