Concept of Day, Hour, Minute, Second

Q. What is mean by a mean solar day

Q.

What are the S.I. units of mass, length time and temperature?

Write their names and symbols?

Q.

Lightyear is the unit of time.

1. True
2. False

Q.

1 mean solar day=_______s

1. 864000

2. 86400

3. 8640

Q.

SI unit of time is mean solar day

1. True
2. False

Q.

Define light year. What is expressed in light years?

Q.

Define temperature and give its unit. [1 MARK]

Q. nta particle executing shm between x=+-a . the time taken to go from 0 to a/2 is T1 and to go from a/2 to a is T2 thenn nt.T1T2n nt.T1=T2 .T1=2T2n

Q.

Define the term:

Mean solar day

Q.

Fill in the blanks using suitable word(s).

Light year is a unit of _____.

Q.

SI unit of a time is a solar day

1. True
2. False

Q.

What is a photon?

Q.

What do you mean by a light year ? Is a light year unit of time or a unit of length ?

Q. How long does it take for Earth to complete one rotation

Q.

The average of all solar days in which the earth completes one revolution around the sun is called ______

1. solar day

2. mean solar day

3. hour

4. millennium

Q.

Is there a second less than a nano second

Q.

The average of all solar days in which the earth completes one revolution around the sun is called ____.

1. solar day

2. mean solar day

3. hour

4. millenium

Q. Identify the fundamental SI units for mass, length, and time, respectively:

1. newton, meter, minute.
2. kilogram, meter, second.
3. pound, foot, hour.
4. pound, foot, second.
5. kilogram, centimeter, hour.

Q. 1 parsec is approximately equal to ( when AU is an astronomical unit)

1. 2* 10⁵ AU
2. 2* 10⁶AU
3. 2* 10⁸ AU
4. 2* 10¹⁰ AU

Q. What is the S.I. of time.
Write its name and symbol.

Q. One hour is equivalent to 3600 seconds.

1. True
2. False

Q. Pressure is a standard unit of time.

1. True
2. False

Q. Name two units of time bigger than a second. How are they related to second?

Q.

1 mean solar day = _________ s

1. 8640000

2. 86400

3. 8640

Q.

$\text{State the number of seconds in a day.}$

1. $\text{86000 seconds}$

2. $\text{36000 seconds}$

3. $\text{86400 seconds}$

4. $\text{24000 seconds}$

Q. Which of the following is incorrect?

1. 1 mean solar day = 24 hours

2. 1 hour = 60 minutes

3. 1 minute = 100 seconds

4. 10 years = 10 decade

Q. Complete the following:
(a) 1 nano second = _____s
(b) 1 $\mu$s = _____s
(c) 1 mean solar day = _____s
(d) 1 year = _____s

Q.

Name the three fundamental units.

Q.

1 mean solar day = _________

1. 864000

2. 86400

3. 8640

Q.

the unit of time in that system in which the unit of length is metre , unit of mass kg and unit of force kg wt is

1) 1 / √9.8 sec

2) (9.8)² sec

3)√9.8 sec

4) 9.8 sec