Class 1 Exam > Class 1 Notes > Mental Maths > Worksheet Solutions: Time
Worksheet Solutions: Time | Mental Maths - Class 1 PDF Download
Q1: Show the Correct Time
(i)
(a) 12:00
(b) 5:00
(c) 6:00
(d) None of these
Ans: (b)
(ii)
(a) 6:30
(b) 7:35
(c) 7:30
(d) None of these
Ans: (c)
(iii)
(a) 9:22
(b) 4:42
(c) 10:42
(d) None of these
Ans: (a)
(iv)
(a) 2:10
(b) 10:10
(c) 9:10
(d) None of these
Ans: (c)
(v)
(a) 4:55
(b) 11:22
(c) 12:42
(d) None of these
Ans: (b)
Q2: Draw the hands to show the correct time.
(i) 7 o’clock
Ans.
(ii) 3 o’clock
Ans.
(iii) 11 o’clock
Ans.
(iv) Quarter past 4
Ans.
(v) Quarter to 9
Ans.
Q3. Multiple Choice Questions (MCQs)
(i) Sunrise happens around 4:45 _____
(a) AM
(b) PM
(c) AM/PM
(d) None of these
Ans. (a) AM
The sun rises in the morning, and morning time is called AM.
(ii) Bob take his dinner at 9:30 _____
(a) AM
(b) PM
(c) Noon
(d) None of these
Ans. (b) PM
Bob eats dinner at night, and night time is called PM.
(iii) 3 hours after 12:00 noon is _____
(a) 2:00 AM
(b) 3:00 AM
(c) 3:00 PM
(d) None of these
Ans. (c) 3:00 PM
12:00 noon means midday, when the sun is high in the sky.
If we add 3 hours:
1 hour later → 1:00 PM
2 hours later → 2:00 PM
3 hours later → 3:00 PM
(iv) 2 hours before 12:45 AM is _____
(a) 11:45 PM
(b) 10:45 AM
(c) 11:45 AM
(d) 10:45 PM
Ans. (d) 10:45 PM
12:45 AM is just after midnight
If we go 1 hour back, it becomes 11:45 PM (night time).
If we go 2 hours back, it becomes 10:45 PM (night time).
(v) Convert 5 days 9 hours into hours
(a) 119 hours
(b) 129 hours
(c) 127 hours
(d) None of these
Ans. (b) 129 hours
1 day = 24 hours
So, 5 days = 5 × 24 = 120 hours
Add the extra 9 hours:
120 + 9 = 129 hours
(vi) Convert 5 hours 45 minutes into minutes
(a) 345
(b) 245
(c) 445
(d) None of these
Ans. (a) 345
(vii) How many minutes are there from half past 4 to quarter past 5?
(a) 25 Minutes
(b) 30 Minutes
(c) 40 Minutes
(d) 45 Minutes
Ans. (d) 45 Minutes
1 hour = 60 minutes
5 hours = 5 × 60 = 300 minutes
Add the extra 45 minutes:
300 + 45 = 345 minutes
(viii): How many hours and minutes are there from quarter past 5 to half past 8?
(a) 2 hours 30 minutes
(b) 3 hours 15 minutes
(c) 3 hours 30 minutes
(d) None of these
Ans. (b) 3 hours 15 minutes
Quarter past 5 means 5:15.
Half past 8 means 8:30.
From 5:15 to 8:15 = 3 hours.
From 8:15 to 8:30 = 15 minutes.
So total = 3 hours 15 minutes.
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FAQs on Worksheet Solutions: Time - Mental Maths - Class 1
| 1. What are the different types of clocks used to measure time? |  |
Ans. There are several types of clocks used to measure time, including analog clocks, digital clocks, atomic clocks, and sundials. Analog clocks use hands to indicate time on a dial, while digital clocks display time numerically. Atomic clocks are highly accurate and rely on the vibrations of atoms, and sundials use the position of the sun's shadow to indicate time.
| 2. How do time zones affect the measurement of time globally? | |
Ans. Time zones are regions of the Earth that have the same standard time. They are based on the longitudinal position of a place relative to the Prime Meridian. As the Earth rotates, different parts experience daylight and darkness, leading to the need for different time zones to standardize time across regions. This affects travel, communication, and scheduling events globally.
| 3. What is the significance of the 24-hour clock system? | |
Ans. The 24-hour clock system, also known as military time, is significant because it eliminates ambiguity in time representation. In this system, hours are numbered from 00 to 23, allowing for clear distinction between AM and PM. This is particularly useful in fields such as aviation, healthcare, and military operations where precise timing is crucial.
| 4. How is time measured in scientific experiments? | |
Ans. In scientific experiments, time is measured using precise instruments such as stopwatches, timers, or computer software that can record time intervals accurately. In physics, time is often measured in seconds, and for high-precision experiments, atomic clocks may be used to ensure accuracy down to fractions of a second. This allows researchers to replicate experiments reliably.
| 5. What historical events led to the standardization of timekeeping? | |
Ans. Several historical events contributed to the standardization of timekeeping. The introduction of the mechanical clock in the Middle Ages allowed for more accurate time measurement. The establishment of time zones in the late 19th century, particularly during the International Meridian Conference in 1884, aimed to create a uniform system for timekeeping across the globe. This led to the adoption of the Greenwich Mean Time (GMT) as a standard reference.
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