Question

Periodic Assessment Test
Science
Std -8
Time - 1 Hour
January, 2021
Marks. 25
Question 1 (A) Choose the correct answer from given below.
(3)
1. Voice of which of the following is likely to have minimum frequency?
a) Baby girl b)Baby boy
c)A man
d) A woman
2. Which of the following cannot be change easily by friction?
a) Plastic scale b) A copper rod c) an inflated balloon d) A woolen cloth.
3. -'Animal can hear sound of frequency higher than 20,000 Hz.
a) cat
c) lion
d) elephant.
(B) fill in the blanks.
b) dog
(2)
1. The unit of frequency is-
2.The power of an earthquake is expressed in terms of magnitude on a scale called​

Answer 1

Answer:

1. a

2.b

3. a. dog

3.b = hertz

4. ritcher scale