The Causeway School Mid Term Examination 2017 Grade: _One_ Subject: Eng (A+B) Name____________________________ Time:30 min

Total:30

Obt.Marks__________________________

Teacher's Sig_______________Parent’s Signature ______________________ Q#1: Multiply Choose Question. 1- When a body moves to and from about a point its motion is called : a. Random motion

b. liner motion

c. vibratory

d. rotary motion

2- If the mass of a spring mass system is doubled, its the time period becomes:

a- √2𝑇

b.

𝑇

(2)

c. √

𝑇 2

d.

𝑇 √2

3- If a wave moves in a slinky with frequency of 4Hz and wave length of 0.4m the speed of the wave will be:

a. 1.0ms-1

b. 1.2ms-1

c. 1.4ms-1

d. 1.6ms-1

4- The Character by which loud and faith sound can be distinguished is called:

a. Pitch

b. quality

c. Loudness

d. intensity

5- Mathematical formula of sound level (in bel) is: 1

a. 𝑆. 𝐿 = 10 log d. 𝑆. 𝐿 = 10 log

10 10 1

(𝑏𝑒𝑙)

b. 𝑆. 𝐿 = 𝐾 log

1 10

(𝑏𝑒𝑙) c. 𝑆. 𝐿 = log

1 10

(𝑏𝑒𝑙)

(𝑏𝑒𝑙)

6- The principal focus of a concave mirror is: a. virtual

b. real

c. imaginary

d. dual aspect

7-Snells law is status as: a.

𝑆𝑖𝑛 𝑖 𝑆𝑖𝑛 𝑟

=

𝑛1

b.

𝑛1

𝑆𝑖𝑛 𝑖 𝑆𝑖𝑛 𝑟

=

𝑛2

c.

𝑛1

𝑆𝑖𝑛 𝑖 𝑆𝑖𝑛 𝑟

=

𝑛2 𝑛1

d.

𝑆𝑖𝑛 𝑖 𝑆𝑖𝑛 𝑟

=

2𝑛2 𝑛1

8- optical fibers work on the principal of: a. refraction

b. reflection c. total international reflection d. diffraction

9- The SI units of electric field intensity is:

a. NC2

b. NC-1

c. NS

d. Nm-1

c.

d. fuse

10-Which device is used to store charge:

a. Resists

b. Capacitor

Dielectric

Q#2: write a short answer. i-

Define elastic restoring force?

ii-

Define time period. Write the formula for the time period of a simple pendulum?

iii-

what are wave?

iv-

What are transverse waves. Explain with the help of wave form?

v-

On what factors does the loudness of sound depend?

vi-

define pitch of sound. Explain that pitch is dependent upon frequency?

vii-

What is intensity level?

viii- can sound pass through vacuum /why? ix-

Define between concave lens and convex lens?

x-

State the laws of reflection of light?

xi-

What is the meant by critical angles?

xii-

What are the main types of lenses?

xiii- What is a gold leaf electroscope?