| 23 | Na + X → | 20 | F + | 4 | He | |
| 11 | 9 | 2 |
What particle is X in the reaction above?
Alpha
Beta
Neurons
Gamma
Correct answer is C
The particle in the reaction is neutron
| 23 | Na + | 1 | n → | 20 | F + | 4 | He |
| 11 | 0 | 9 | 2 |
1Ω
2Ω
3Ω
4Ω
Correct answer is B
p>IR = 0.6 X I ( R + r )
I X 3 = 0.6 X I ( 3 + r )
3I / 0.6I = 3 + r
5 = 3 + r
r = 2 ohms
The electromagnetic wave that can produce a heating effect on the environment is
x -rays
ultraviolet rays
infrared rays
gamma rays
Correct answer is B
No explanation has been provided for this answer.
Both X and Y are negative
Both X and Y are positive
X is positive and Y is negative
X is negative and Y is positive
Correct answer is B
No explanation has been provided for this answer.
An electric iron is rated 1000W, 230V. What is the resistance of its elements?
51.9Ω
52.9Ω
55.9Ω
57.6Ω
Correct answer is B
Electric Power = IV = I2R = V2/R thus for a device rated 1000 W, 230V, from the relation P = V2/R, 1000 = (230)2/R
=> R = (230)2/1000
= 52900/1000 = 52.9Ω
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