A. Lead
B. Mercury
C. Chromium
D. Copper
Submitted by: Malik Asghar Hussain
Author: Malik Asghar Hussain
A. Camera
B. Spectroscope
C. Cinema
D. Periscope
Submitted by: Malik Asghar Hussain
A. a-rays
B. X-rays
C. b-rays
D. U.V.-rays
Submitted by: Malik Asghar Hussain
A. Sound wave
B. ‘X’-ray
C. Ultra-sound wave
D. Magnetic wave
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A. Air pollution
B. Water pollution
C. Solid waste
D. Noise pollution
Submitted by: Malik Asghar Hussain
A. Reflection
B. Refraction
C. Interference
D. Illumination
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A. gravity
B. winds
C. clouds
D. rotation of the Earth
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A. Fusion reaction
B. Fission reaction
C. Chemical reaction
D. Photo-Chemical reaction
Submitted by: Malik Asghar Hussain
A. remain the same
B. decrease
C. become zero
D. increase
Submitted by: Malik Asghar Hussain
A. 365 days
B. 30 days
C. 24 hours
D. changing continuously
Submitted by: Malik Asghar Hussain
