According to Joule's law of heating, heat produced H = I2Rt, where I is current, R is resistance and t is time. If the errors in the measurement of I, R and t are 3%, 4% and 6% respectively then error in the measurement of H is

(1) ± 17%

(2) ± 16%

(3) ± 19%

(4) ± 25%

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If there is a positive error of 50% in the measurement of velocity of a body, then the error in the measurement of kinetic energy is

(1) 25%

(2) 50%

(3) 100%

(4) 125%

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A physical quantity P is given by P = A3B12C4D32. The quantity which brings in the maximum percentage error in P is

(1) A

(2) B

(3) C

(4) D

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If L = 2.331 cm, B = 2.1 cm, then L + B =

(1) 4.431 cm

(2) 4.43 cm

(3) 4.4 cm

(4) 4 cm

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Significant Figures
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The number of significant figures in all the given numbers 25.12, 2009, 4.156 and 1.217×104 is 

1. 1

2. 2

3. 3

4. 4

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Significant Figures
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If the length of rod A is 3.25 ± 0.01 cm and that of B is 4.19 ± 0.01 cm then the rod B is longer than rod A by 

(1) 0.94 ± 0.00 cm

(2) 0.94 ± 0.01 cm

(3) 0.94 ± 0.02 cm

(4) 0.94 ± 0.005 cm

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A physical quantity is given by X=MaLbTc. The percentage error in measurement of M, L and T are α,β and γ respectively. Then maximum percentage error in the quantity X is

(1) aα+bβ+cγ

(2) aα+bβcγ

(3) aα+bβ+cγ

(4) None of these

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A physical quantity A is related to four observable a, b, c and d as follows, A=a2b3cd, the percentage errors of measurement in a, b, c and d are 1%,3%,2% and 2% respectively. What is the percentage error in the quantity A 

(1) 12%

(2) 7%

(3) 5%

(4) 14%

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If the acceleration due to gravity is 10 ms–2 and the units of length and time are changed in kilometer and hour respectively, the numerical value of the acceleration is 

(1) 360000

(2) 72,000

(3) 36,000

(4) 129600

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If L, C and R represent inductance, capacitance and resistance respectively, then which of the following does not represent dimensions of frequency                        [Only for droppers]

(1) 1RC

(2) RL

(3) 1LC

(4) CL

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