Units and Measurements

Consider two physical quantities A and B related to each other as E= B-x2At where E, x and t have dimensions of energy, length and time respectively. The dimension of AB is

1. L-2M1T0
2. L2M-1T1
3. L0M-1T1
4. L-2M-1T1

The measured value of the length of a simple pendulum is 20 cm with 2 mm accuracy. The time for 50 oscillations was measured to be 40 seconds with 1 second resolution. From these measurements, the accuracy in the measurement of acceleration due to gravity is N%. The value of N is:

1. 6
2. 5
3. 4
4. 8

Match List I with List II. Choose the correct answer from the options given below :

1. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
2. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
3. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
4. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

If 50 Vernier divisions are equal to 49 main scale divisions of a traveling microscope and one smallest reading of main scale is 0.5 mm, the Vernier constant of traveling microscope is

1. 0.01 mm
2. 0.01 cm
3. 0.1 mm
4. 0.1 cm

If mass is written as m=kcPG-1/2h1/2 then the value of P will be : (Constants have their usual meaning with k a dimensionless constant)

1. 1/3
2. -1/3
3. 1/2
4. 2

The resistance R= VI where V=(200 5) V and I=(20 0.2) A, the percentage error in the measurement of R is :

1. 5.5%
2. 3%
3. 7%
4. 3.5%

A physical quantity Q is found to depend on quantities a, b, c by the relation Q= a4b3c2. The percentage error in a, b and c are 3\%, 4\% and 5\% respectively. Then, the percentage error in Q is :

1. 43%
2. 34%
3. 66%
4. 14%

Identify the physical quantity that cannot be measured using spherometer :

1. Radius of curvature of concave surface
2. Specific rotation of liquids
3. Thickness of thin plates
4. Radius of curvature of convex surface

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Statement I is true but Statement II is false
2. Both Statement I and Statement II are false
3. Both Statement I and Statement II are true
4. Statement I is false but Statement II is true

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

1. Both (A) and (R) are correct and (R) is the correct explanation of (A)
2. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true