646.
A.
gamma ray
B.
electron
C.
neutron
D.
proton
Correct answer is B
No explanation has been provided for this answer.
647.
A.
1
B.
2
C.
3
D.
4
Correct answer is A
No explanation has been provided for this answer.
648.
A.
1
B.
2
C.
3
D.
4
Correct answer is C
No explanation has been provided for this answer.
649.
A.
yellow
B.
red
C.
black
D.
blue
Correct answer is C
No explanation has been provided for this answer.
650.
In the fig above, what is the angle of reflection of the ray of light at mirror M?
A.
\( 90^{\circ} \)
B.
\( 60^{\circ} \)
C.
\( 45^{\circ} \)
D.
\( 30^{\circ} \)
Correct answer is B
No explanation has been provided for this answer.
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