Time and Speed

Q.

A long-distance train is scheduled to reach its destination in $19$ hours. After $10$ hours of journey, due to disruption of rail traffic, the train has to be stationed for $1$ hour. If the average speed of the train is $100$km/hr, at what speed should it travel to cover the distance in same amount of time?

Q. An artificial satellite is moving in a circular orbit of radius $8400km$ around the earth. What is its speed if it takes one day to complete one revolution?

1. $4099\text{kmph}$
2. $3099\text{kmph}$
3. $2198\text{kmph}$
4. $2099\text{kmph}$

Q.

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours for one revolution..

1. 2.07 km/s

2. 3.07 km/s

3. 4.21 km/s

4. 1.28 km/s

Q.

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

1. 1.28 km/s

2. 4.21 km/s

3. 2.07 km/s

4. 3.07 km/s

Q. is not a fundamental quantity.

1. Length
2. Mass
3. Speed

Q. A motorcyclist drives from place $A$ to $B$ with a uniform speed of $30kmh-1$ and returns from place $B$ to $A$ with a uniform speed of $20km{h}^{-1}$. Find his average speed.

Q.

A particle starts from rest and moves with a constant acceleration of $a_{1}m{s}^{-2}$ for sometime and then decelerates to come to rest at constant acceleration of $a_{2}m{s}^{-2}$. If the time for which particle is in motion is $t$, find the time for which the particle accelerates with acceleration $a_1$

1. $\frac{a_2}{a_1+a_2}\times t$

2. $\frac{a_1}{a_2}\times t$

3. $\frac{a_1}{a_1+a_2}\times t$

4. $\frac{a_2}{a_1}\times t$

Q. An artificial satellite is moving in a circular orbit of radius $8400km$ around the earth. What is its speed if it takes one day to complete one revolution?

1. $2099\text{kmph}$
2. $2198\text{kmph}$
3. $3099\text{kmph}$
4. $4099\text{kmph}$

Q.

A 60 m long train moving on a straight level track passes a pole in 5 seconds, find the speed of the train and the time it will take to cross a 540 m long bridge.

1. 15 m/s, 65 s

2. 13 m/s, 40 s

3. 25 m/s, 30s

4. 12 m/s, 50s

Q. An insect moves along the sides of a wall of dimension $12m\times 5m$, starting from one corner and reaches the diagonally opposite corner. If the insect takes $2s$ for its motion, then find the ratio of average speed to average velocity of insect.

1. $12:5$
2. $13:5$
3. $17:13$
4. $17:12$

Q. Light year is a unit of time.

1. True
2. False

Q. Car $A$ travels $x$ km for every litre of petrol, while car $B$ travels $(x+5)$ km for every litre of petrol.Write down the number of litres of petrol used by car $A$ and car $B$ in covering a distance of $400$ km

Q.

A person taking part in triathlon records his average speeds when running, cycling and swimming. His average speed when swimming was 18 km/h, average speed when running was 7 m/s and the average speed when cycling was 2 km/min. Based on the given information, which of the following statements are true?

1. The average speed when cycling is higher than swimming and running

2. The average speed when swimming is higher than cycling and running

3. The average speed when running is higher than swimming and cycling

4. The average speed of all the three is the same.

Q.

A train travels 40 km at a uniform speed of $30km{h}^{-1}$. Its average speed for the whole journey after travelling another 40 km is $45km{h}^{-1}$. Its speed in the second half of the journey is ____.

1. $45km{h}^{-1}$

2. $90km{h}^{-1}$

3. $60km{h}^{-1}$

4. $30km{h}^{-1}$

Q.

A $60m$ long train moving on a straight level track passes a pole in $5s$, find the speed of the train and the time it will take to cross a $540m$ long bridge.

1. 13 m/s, 40 s

2. 25 m/s, 30s

3. 12 m/s, 50s

4. 15 m/s, 65 s

Q.

John covers a part of the journey at $20km/hr$ and the remaining at $70km/hr$, taking a total of $8$ hours to cover the distance of $400km$. How many hours he has been driving at $20km/hr$?

1. 3 hours 12 minutes

2. 2 hours

3. 3 hours 20 minutes

4. 4 hours 40 minutes

Q.

John covers a part of the journey at 20 $km/hr$ and the remaining at 70 $km/hr$ , taking total of 8 hours to cover the distance of 400 km. How many hours he has been driving at 20 $km/hr$?

1. 4 hours 40 minutes

2. 3 hours 12 minutes

3. 3 hours 20 minutes

4. 2 hours

Q. A person drives his car for $3$ hours at a speed of $40$ km/hr and for $4.5$ hours at a speed of $60$ km/hr. At the end of it, he finds that he was covered $\frac{3}{5}$ of the total distance. What is the uniform speed with which he should further drive to cover the remaining distance in $4$ hours?

1. $35$ km/hr
2. $50$ km/hr
   
3. $20$ km/hr
   
4. $65$ km/hr
   

Q.

$36\frac{km}{hr}$ = ___ $\frac{m}{s}$

Q. A man travelled a distance of $22$km in one hour, partly in a car at a speed of $30$km/hr and partly on a motorcycle at $18$km/hr. Find the distance travelled by him in the car.

Q. A $60m$ long train moving on a straight level track passes a pole in $5s$. Find the speed of the train and the time it will take to cross a $540m$ long bridge.

1. $12m{s}^{-1}$, $50s$
2. $15m{s}^{-1}$, $65s$
3. $13m{s}^{-1}$, $40s$
4. $25m{s}^{-1}$, $30s$

Q. A farmer travelled a distance of $61$ km in $9$ hours. He travelled partly on foot at $4$ km/hr and partly on bicycle at $9$ km / hr. The distance travelled on foot is:

1. $14$ km
2. $15$ km
3. $16$ km
4. $17$ km

Q.

36 km/h = ___ m/s

Q. A bike travels a distance of $200km$ at a constant speed. If the speed of the bike is increased by $5km$. an hour, the journey would have taken $2$ hours less. What is the speed of the bike?

1. $15km/hour$
2. $30km/hour$
3. $25km/hour$
4. $20km/hour$

Q.

A 60 m long train moving on a straight level track passes a pole in 5 s, find the speed of the train and the time it will take to cross a 540 m long bridge.

1. 12 m/s, 50s

2. 15 m/s, 65 s

3. 13 m/s, 40 s

4. 25 m/s, 30s

Q. Out of a total distance covered of $200$ km, first half is covered at the speed of $60$ km / hr and the remaining half is covered at $75$ km/hr . Find the total time taken to cover the whole journey.

1. $3$ hours
2. $2$ hour
3. $1$ hours
4. $4$ hours

Q.

During uniformly accelerated motion, displacement of an object is proportional to _____ of time.

1. quad

2. square

3. thrice

4. twice

Q. Body A is moving faster than a body B, if it covers less distance than B in the same amount of time.

1. False
2. True

Q.

If the speed of a vehicle is said to be $50m/s$ and the time taken to travel a certain distance is $10s$. Then, what is the distance traveled?

1. $25m$.

2. $500m$.

3. $5m$.

4. $500cm$.

Q. An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

1. $3.07km{s}^{-1}$
2. $5km{s}^{-1}$
3. $4.5km{s}^{-1}$
4. $7km{s}^{-1}$