Explain the three particles that make up an atom?
What is the quantity?
When is fluorescence strong?
Explain about Cosmic rays?
Why so coloured clothes sometimes fade in sunlight ?
State the laws of thermodynamics.
What is the Magnetic substance ?
Explain the Reflection of Light ?
How do you magnetize metal?
What is non metals ?
What is amplitude?
What does gravitational force depend on?
Why ate some clocks slow in summer and fast in winter ?