at the centre of curvature
at the principal focus
between the pole and principal focus
between the centre of curvature and principal focus
Correct answer is A
No explanation has been provided for this answer.
0.001s
0.010s
10.000s
100.000s
Correct answer is B
Compare: Y = 2 sin 2 \(\pi (\frac{t}{0.01} - \frac{x}{30})\)
with the wave equation,
y = A sin 2 \(\pi (\frac{t}{T} - \frac{x}{\lambda}\))
⇒ \(\frac{t}{T} = \frac{t}{0.01}\)
T = 0.010s
When salt is dissolved in water, the freezing point of the water
increases
decreases
remains the same
increases and later decrease
Correct answer is B
The salt in the water (same for any other impurities) lowers the freezing point of the solution so that water freezes at a lower temperature.
4200J
1600J
24000J
96000J
Correct answer is D
Q = I2RT
= 42 x 50 x 2 x 60
= 96000J
105J
3255J
3465J
16821J
Correct answer is C
Q = ML + MC\(\theta\)
= 10 x 335 + 10 x 2.1 x 5
= 3465J