Time

Q. Which of the following sets cannot enter into the list of fundamental quantities in any system of units?

1. Length, Mass and Velocity
2. Length, Time and Velocity
3. Mass, Time and Velocity
4. Length, Time and Mass

Q.

How many years is a decade, a century?

Q. Two objects move towards each other till they meet at a point. The speed of first object is $5m{s}^{-1}$ and the speed of the second object is $10m{s}^{-1}$. If the distance between the objects is $30m$ initially, what is the difference between the distances travelled by the two bodies?

1. $5m$
2. $10m$
3. $20m$
4. $30m$

Q.

Question 2

Which of the following does not express a time interval?

(a) A day

(b) A second

(c) A school period

(d) Time of the first bell in the school

Q.

Speed is a fundamental physical quantity.

1. True
2. False

Q.

An hourglass or a sandglass comprises of two identical glass bulbs connected vertically by a narrow neck. It is used to measure

1. Length

2. Mass

3. Amount of sand

4. Time

Q.

Chose the odd one out.

century, solar day, light year, second

Q. Tarun got to know that the next nearest star to us is Alpha Centauri and is at a distance of 4 light years from the Earth. What does it mean?

1. Light has to travel 48 months to reach that star.

2. Light has to travel 40 years to reach that star.

3. Light has to travel 43 months to reach that star.

4. Light has to travel 4 months to reach that star.

Q.

Why stopwatch is used instead of wristwatch in athletics meet.?

Q.

Which of the following does not express a time interval?

1. A day

2. A second

3. A school period

4. Time of the first bell in the school

Q.

A minute is a fraction of the mean solar day.

1. True
2. False

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

1. Day
2. Hour
3. Minute
4. Light year

Q.

Sita accompanies her father to the park for fun. While there, she hops on the swing and begins a motion characterised by a complete back and forth cycle every $2s$. The period of swing is________.

1. $0.5s$

2. $1s$

3. $2s$

4. None of these

Q. A ______ is the interval from one noon to the next noon.

1. mean solar day
2. solar day
3. lunar day
4. day

Q.

Harish runs faster than Suresh to cover the same distance. Which fundamental physical quantity is used for comparing their speeds?

1. Time

2. Length

3. Mass

4. Both mass and time

Q. In order to cover a certain distance in a shorter time, the object should have a greater ___.

1. Mass
2. Speed
3. Volume
4. None of these

Q.

1000 year is called one century.

1. True
2. False

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

1. Hour
2. Light year
3. Minute
4. Day

Q.

What is a sundial?

1. Time measuring device

2. Speed measuring device

3. Distance measuring device

4. None of these

Q. If a man walks 20 km at 5 km/hr, he will be late by 40 minutes. if he walk at 8 km per hr, how early from the fixed time will he reach?

1. 15 minutes
2. 25 minutes
3. 1.5 hours
4. None of these
5. 50 minutes

Q. Which of the following is incorrect?

1. 1 mean solar day = 24 hours

2. 10 years = 10 decade

3. 1 hour = 60 minutes

4. 1 minute = 100 seconds

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

1. Minute
2. Day
3. Hour
4. Light year

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

1. Hour
2. Light year
3. Minute
4. Day