The thermopile is a device for detecting
radioactive radiations
radiant energy
x-rays
the presence of electrons
Correct answer is B
No explanation has been provided for this answer.
100.06 cm2
100.12cm2
100.24cm2
100.36cm2
Correct answer is C
Formula: A\(_2\) = A\(_1\)(1 + \(\beta \theta\))
where \(\beta\) = The area expansivity
\(\theta\) = Change in temperature.
\(\beta\) = 2\(\alpha\)
where \(\alpha\) = linear expansivity of the body.
⇒ \(\beta\) = 2 x 0.000017
= 0.000034 K\(^{-1}\)
\(\therefore\) A\(_2\) = 100 (1 + (0.000034 x 70))
= 100(1 + 0.00238)
= 100(1.00238)
= 100.238 cm\(^2\)
= 100.24 cm\(^2\) (to 2 d.p)
250.0s
25.0s
2.5s
0.5s
Correct answer is B
Force x Distance = Power x Time
Time = \(\frac{Force \times Distance}{Power}\)
= \(\frac{20 \times 500}{0.4 \times 1000}\)
= 25.0s
joule
kelvin
watt
ampere
Correct answer is A
Heat is a form of energy (heat energy). The S.I unit of energy generally is Joules (J).
upward at uniform speed
upward with uniform acceleration
downward with uniform speed
downward with uniform acceleration
Correct answer is D
No explanation has been provided for this answer.