When the human eye loses its power of accomodation, the defect is known as
short sightedness
presbyopia
astigmatism
long sightedness
Correct answer is B
presbyopia is loss of accommodation
6 v, 6.0Ω
2 v, 0.7Ω
2 v, 6.0Ω
6 v, 0.7Ω
Correct answer is B
Total energy in parred connection is equal to emt of one cell, = 2v but total internal resistance is given by
(1)/r = (1)/r1 + (1)/r2 + (1)/r3 = (1)/2 + (1)/2 + (1)/2 = (3)/2
∴ r = (2)/3 = 0.67Ω
I, II,III and IV
I, II and III
I, III and IV
I, II and IV
Correct answer is D
No explanation has been provided for this answer.
Steam burn is more severe than that of boiling water because
steam burn is independent of relative humidity
steam possesses greater heat energy per unit mass
water boils at a higher temperature
steam burn is dependent on relative humidity
Correct answer is B
The specific latent heat of vaporization of steam is 2.1 x 106JKg-1
while the energy required to raise the temperature of a unit mass of water from 0°c to 100°c = C x Dt = 4200 x 100 = 420000 = 4.2 x 105 JKg-1
∴ steam possesses greater heat energy per unit mass
900 JK-1
90 JK-1
100 JK-1
200 JK-1
Correct answer is A
Heat supplied = Heat gained Pt = MCDθ
30 x 5 x 60 = c x 10
where c = mc which is the heat capacity
c = (30 x 5 x60)/10 = 900 JKg-1