Page 216 - Science Class 08

B. Write True or False.

1. Liver and salivary glands are examples of exocrine glands.
2. The sole of your shoes wear out in a few months due to fric on.
3. Charges produced by ribbing depends on the nature of the object rubbed together.

4. Nega vely charged ions are called ca ons.
5. The first ar ficial satellite sputnik-I was launched by the USA.

C. Match the following columns.
Column I Column II
1. Vasopressin a. Progesterone
2. Thyroid gland b. Cor coids

3. Adrenal gland c. Glucagon
4. Pancreas d. Volume of the blood
5. Ovaries e. Thyroxin
D. Write the correct name for.

1. the number of oscilla ons of a body per second : ___________________________
2. the feature of sound that depends on amplitude : ___________________________
3. the feature of sound depending on frequency : ___________________________

4. the factor on which audibility of sound depends : ___________________________
E. Very short answer ques ons.
1. Name any two exocrine glands.
2. What is force?

3. What happens when a flute is played?
4. What is electricity?
F. Short answer ques ons.
1. What is puberty?

2. Describe mechanical force.
3. What is amplitude?
4. How many kinds of musical sounds are there?
5. How can an object be charged?
G. Long answer ques ons.

1. Height is the most no ceable change that take place during the puberty. How?
2. What are the advantages of fric on?
3. What is a sound wave? How does it take shape? Explain through a clear diagram.

4. Explain how ligh ng occurs between two clouds during a storm?
5. How does sound travel through solids, liquids and gases?

216 Science-8