8cm
10cm
15cm
18cm
20cm
Correct answer is B
Radius of curvature(r)=12cm
focal length(F) = r ÷ 2 → 12 ÷ 2 = 6cm
therefore F = 6cm
magnification(M) = v ÷ u
1.5 = v ÷ u
:v = 1.5u
Using mirror formula
1/f =1/v + 1/u
\(\frac{1}{6}\) =\(\frac{1}{1.5u}\) + \(\frac{1}{u}\)
\(\frac{1}{6}\) = \(\frac{1 + 1.5}{1.5u}\)
\(\frac{1}{6}\) = \(\frac{2.5}{1.5u}\)
1 * 1.5u = 2.5 * 6
u = \(\frac{15}{1.5}\) = 10
therefore object distance =10cm.
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
angle of declination
angle of depression
angle of dip
latitude of the place
longitude of the place
Correct answer is A
No explanation has been provided for this answer.
ammeter
avometer
coil resistor
multiplier
shunt
Correct answer is E
No explanation has been provided for this answer.
The relative density of dilute tetraoxosulphate (vi) acid in a battery is measured with a
barometer
hydrometer
manometer
hypsometer
Correct answer is B
No explanation has been provided for this answer.
Calculate the energy stored in an inductor of inductance 0.5H when a current of 3A flows through it.
15.00 J
9.45 J
6.00 J
4.50J
2.25 J
Correct answer is E
No explanation has been provided for this answer.