Ch-13 Questions 21 to 40

Chapter-13

Motion and Time

Sr NO.	QUESTION	ANSWER
21.	The metallic ball of the pendulum is called the ____ of the pendulum.	Bob.
22.	Give an example of a periodic or oscillatory motion	When the bob of the pendulum is released after taking it slightly to one side, it begins to move to and fro. The to and fro motion of a simple pendulum is an example of a periodic or an oscillatory motion.
23.	When we can conclude that pendulum completed one oscillation?	The pendulum is said to have completed one oscillation when its bob, starting from its mean position O, moves to A, to B and back to O. The pendulum also completes one oscillation when its bob moves from one extreme position A to the other extreme position B and comes back to A.
24.	What you mean by time period of a pendulum?	The time taken by the pendulum to complete one oscillation is called its time period.
25.	The time measured by _____ clocks is much more accurate than that by the clocks available earlier.	Quartz.
26.	The basic unit of time is a_____.	Second.
27.	The basic unit of time is a Second. Its symbol is ___.	s (small english alphabet letter 's')
28.	Larger units of time are _______ and_______.	Minutes (min), hours (h).
29.	What would be the basic unit of speed?	Since the speed is distance/time, the basic unit of speed is m/s. Of course, it could also be expressed in other units such as m/min or km/h. You must remember that the symbols of all units are written in singular. For example, we write 50 km and not 50 kms, or 8 cm and not 8 cms.
30.	How many seconds there are in a day and how many seconds in a year. Can you help him?	Seconds in a day: Number of seconds in I minutes=60 I hour is equal to 60 minutes. Number of seconds in one hour is sixty seconds sixty times. Number of seconds in one hour equal to 3600 seconds. One day is equal to 24 hours. One day is equal to 3600 seconds 24 times. Number of seconds in one day is equal to 86400 seconds. Seconds in a year: One year is equal to 365 and ¼ days(precisely). Number of seconds in one year 864400 seconds 365.25 times. Number of seconds in one year is 31557600 seconds. Number of seconds in one year is three crore fifteen lakh fifty seven thousand six hundred seconds.(31.55 million seconds).
31.	How many hours in a year?	One day is equal to 24 hours. One year is equal to 365 and ¼ days. Number of hours in one year is 24 hours 365.25 times. Number of hours in one year is 9131.25 hours.
32.	The pulse of a normal healthy adult at rest beats about 72 times in a minute that is about ____ times in 10 seconds.	12 (approximately).
33.	How time was measured when pendulum clocks were not available.	Sundials, water clocks and sand clocks were used before the discovery of pendulum.
34.	Rocket launching satellites into earth's orbit, often attain speeds up to _____ /s. 8 km.	8 km.
35.	A tortoise can move only with a speed of about ____/s.	8cm.
36.	How fast is the rocket compared with the tortoise?	Speed of a rocket is 8 km/s. Speed of a tortoise is 8cm/s Calculate how many centimeters are in one KM. One meter is equal to 100 centimeters. One kilometer is equal to 1000 meters. One kilometer is equal to 100 centimeters 1000 times. One kilometer is equal to 10000 centimeters. Compare the speed of a rocket with that of a tortoise. Eight kilometer is equal to 10000 centimetes 8 times. Eight kilometer is equal to 80000 centimeters. How many times is the speed of tortoise to the speed of a rocket: 80000 is devided by 8 which is equal to 10000 times. Speed of a rocket is ten thousand times the speed of a tortoise. In other words a rocket complete the distance in one second as that of the distance a tortoise complete in 10000 seconds.
37.	How can find the distance covered by an object in given time.	By multiplying speed by time we can calculate distance covered by an object in given time. Distance covered=Speed X Time.
38.	How can find the speed taken by an object in a given time.	Find the time an object would take to cover a distance while moving with a given speed. Timetaken = speed/distance
40.	What is the device to calculate the distance covered by a vehicle.	Odometer.

Ch-13 Questions 1 to 20

Chapter-13

Motion and Time

Sr NO.	QUESTION	ANSWER
1.	What are different directions of motion?	Motion could be along a straight line, it could be circular or periodic.
2.	Solution to Table 13.1	Example of motion Type of motion Motion. Along a straight line/circular/periodic Soldiers in a march past. Periodic. Bullock cart moving on a straight road. Strait line. Hands of an athlete in a race. Periodic. Pedal of a bicycle in motion. Circular. Motion of the earth around the sun. Circular Motion of a swing. Periodic. Motion of a pendulum. Periodic.
3.	Ten objects moving along a straight line.	Bicycle or a motor vehicle moving on a straight road. Movement of a bullet from a triggered gun. Water flowing from an open tap. Spitting. Beam of light from a torch. Falling of an object from an elevated floor. Movement of a nail while fixing it. Movement of root of a tree. Movement of a lift. Movement of medicine from a syringe while executing injection.
4.	How we can decide which one is faster during a given interval of time?	One who takes shortest time to cover the distance of 100 metres has the highest speed. A higher speed seems to indicate that a given distance has been covered in a shorter time, or a larger distance covered in a given time.
5.	What are different directions of motion?	Motion could be along a straight line, it could be circular or periodic.
6.	We call the distance covered by an object in a unit time as the ____ of the object.	Speed.
7.	What it mean that, a car is moving with a speed of 50 kilometeters in an hour.	When we say that a car is moving with a speed of 50 kilometres per hour, it implies that it will cover a distance of 50 kilometres in one hour.
8.	A car seldom moves with a constant speed for one hour. The how we can say that a speed of a car is a certain kilometers in one hour?	When we say that the car has a speed of 50 kilometres per hour, we usually consider only the total distance covered by it in one hour. The speed calculated here is actually the average speed of the car.
9.	What is the formula to calculate average speed of a movement?	Speed is the total distance covered divided by the total time taken.
10.	What is non-uniform motion?	If the speed of an object moving along a straight line keeps changing, its motion is said to be non-uniform.
11.	What is uniform motion?	An object moving along a straight line with a constant speed is said to be in uniform motion.
12.	In uniform motion, the average speed is the same as the ____.	Actual speed.
13.	How our elders could tell the approximate time of the day by just looking at shadows?	Our ancestors noticed that many events in nature repeat themselves after definite intervals of time.
14.	What you mean by the phrase 'a day'?	The time between one sunrise and the next was called a day.
15.	What you mean by the phrase 'a year'?	A year was fixed as the time taken by the earth to complete one revolution of the sun.
16.	What you mean by the phrase 'a year'?	A year was fixed as the time taken by the earth to complete one revolution of the sun.
17.	_____ or ______ are perhaps the most common time measuring devices.	Clocks, watches.
18.	How clocks and watches measure time?	It works with the help periodic motion.
19.	One of the most well-known example of periodic motions is ______.	A simple pendulum.
20.	What are the various parts of a pendulum?	A simple pendulum consists of a small metallic ball (bob) or a piece of stone suspended from a rigid stand by a thread

Ch-12 Multy Option Questions

Chapter-12

Reproduction in Plants

Q NO.1. Most plants have roots, stems and leaves. These are called the _______of a plant.
(a). Vegetative parts.	(b). Reproductive Parts.	(c). Circulatory Parts.	(d). None of these.
Q NO.2. After a certain period of growth, most plants bear______.
(a). Roots.	(b). Seeds.	(c). Fruits.	(d). Flowers.
Q NO.3. Mango plants are flowering in ______ and riping in _______?
(a). Winter, Autumn.	(b). Spring, Summer.	(c). Winter, Summer.	(d). Autumn, Summer.
Q NO.4. Flowers are the _________ of a plant.
(a). Vegetative parts.	(b). Reproductive Parts.	(c). Circulatory Parts.	(d). None of these.
Q NO.5. In asexual reproduction new plants are obtained without production of seeds or ____.
(a). Fruits.	(b). Seeds.	(c). Spores.	(d). Flowers.
Q NO.6. Vegetative propagation is a type of ____ reproduction in plants.
(a). Asexual. (b).	Sexual.	(c). Both.	(d). None.
Q NO.7. A _______ is a part of the stem/branch at which a leaf arises.
(a). Axil.	(b). Sexual.	(c). Node.	(d). Eyes.
Q NO.8. _______ is the point of attachment of the leaf at the node.
(a). Axil.	(b). Twigs.	(c). Node.	(d). Eyes.
Q NO.9. Scars present on potato are also called "____" .
(a). Axil.	(b). Twigs.	(c). Node.	(d). Eyes.
Q NO.10. Name another plant which sprout from scar or eyes on it other than potato?
(a). Ginger.	(b). Mango.	(c). Drumstick.	(d). Coconut.
Q NO.11. _________ (sprout leaf plant) has buds in the margins of leaves.
(a). Sweet Potato	(b). Dahlia.	(c).Bryophyllum.	(d). Cacti.
Q NO.12. Give name one plant which reproduce through its roots.
(a). Sweet Potato.	(b). Walnut.	(c).Coconut.	(d). Mango.
Q NO.13. Name a plant which when detached from main plant become an independent plant.
(a). Sweet Potato	(b). Dahlia.	(c).Bryophyllum.	(d). Cacti.
Q NO.14. Plants produce seeds as a result of__________.
(a). Asexual reproduction.	(b). Sexual reproduction.	(c). Both.	(d). None.
Q NO.15. The tiny organisms like _____ can be seen only under a microscope.
(a). Yeast.	(b). Axil.	(c). Twigs.	(d). Node.
Q NO.16. The small bulb-like projection coming out from the yeast cell is called a ____.
(a). Axil.	(b). Twigs.	(c). Node.	(d). Bud.
Q NO.17. Fungi on a bread piece grow from ____ which are present in the air.
(a). Axil.	(b). Twigs.	(c). Spores.	(d). Bud.
Q NO.18. The spores are _____ reproductive bodies.
(a). Asexual.	(b). Sexual.	(c). Both.	(d). None.
Q NO.19. Give name a plant which reproduce by means of Spores?
(a). Asexual.	(b). Moss.	(c). Fungi.	(d). None of these.
Q NO.20. The ______ are the male reproductive part of a flower.
(a).Stamens.	(b). Pistil.	(c). Gametes.	(d). Ovuls.
Q NO.21. The ____ is the female reproductive part of a flower.
(a).Stamens.	(b). Pistil.	(c). Gametes.	(d). Ovules.
Q NO.22. Anther contains Pollen grains which produce male ______.
(a).Stamens.	(b). Pistil.	(c). Gametes.	(d). Ovules.
Q NO.23. The ovary contains one or more____.
(a).Stamens.	(b). Pistil.	(c). Gametes.	(d). Ovules.
Q NO.24. The ______ or the egg is formed in an ovule.
(a).Stamens.	(b). Pistil.	(c). Female Gametes.	(d). Ovules.
Q NO.25. The cell which results after ____ of the gametes is called a zygote.
(a). Fusion.	(b). Fission.	(c). Galvanization.	(d). None of these.
Q NO.26. The cell which results after fusion of the gametes is called a______.
(a).Stamens.	(b). Pistil.	(c). Female Gametes.	(d). Zygote.
Q NO.27. The zygote develops into a/an______.
(a).Stamens.	(b). Pistil.	(c). Embryo.	(d). Zygote.
Q NO.28. After fertilisation, the _____ grows into a fruit and other parts of the flower fall off.
(a). Ovary.	(b). Pistil.	(c). Female Gametes.	(d). Ovules.
Q NO.29. The seeds develop from the _____.
(a).Stamens.	(b). Pistil.	(c). Female Gametes.	(d). Ovules.
Q NO.30. The seed contains a/an _____ enclosed in a protective seed coat.
(a).Fruit.	(b). Embryo.	(c). Flower.	(d). None of these
Q NO.31. Which among the following are a fleshy fruit?
(a). Mango.	(b).Walnut.	(c).Cshewnut.	(d).Almond.
Q NO.32. Which among the following are a hard fruit?
(a). Mango.	(b).Amla.	(c).Orange.	(d).Almond.

Answers
1. (a).	2.(d).	3. (b).	4. (b).	5. (c).	6. (a).	7. (c).	8. (a).	9. (d).	10. (a).
11. (c).	12. (a).	13. (d).	14.(c)	15.(a)	16. (d).	17. (c).	18. (a).	19. (b).	20. (a).
21. (b).	22. (c).	23. (d).	24. (c).	25. (a).	26. (d).	27. (c).	28. (a).	29. (d).	30. (b).
31.(a).	32.(d).

Ch-12 Creossword Puzzle - Solution

Transportation in Animals and Plants

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Ch-12 Crossword Puzzle

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1. Yeast multiply every few hours if sufficient _____ are made available to them.

6. After fertilisation, the _____ grows into a fruit and other parts of the flower fall off.

11. After a certain period of growth, most plants bear______.

12. _______ is the point of attachment of the leaf at the node.

DOWN

2. Scars present on potato are also called "____" .

3. A _______ is a part of the stem/branch at which a leaf arises.

4. In asexual reproduction new plants are obtained without production of seeds or ____.

5. Name another plant which sprout from scar or eyes on it like tomato?

7. Vegetative propagation is a type of ____ reproduction in plants.

8. The zygote develops into an______.

9. The tiny organisms like _____ can be seen only under a microscope.

10. Name a plant which when detached from main plant become an independent plant.

UP

13. The cell which results after fusion of the gametes is called a______.

14. The seeds develop from the _____.