### Class XI

A dimensionally consistent equation
1. is necessarily correct
2. is not necessarily correct
3. is always correct
4. is nearly correct
When two quantities are multiplied or divided, the relative error in the result is
1. the difference of the absolute errors in the multipliers
2. the sum of the absolute errors in the multipliers
3. the difference of the relative errors in the multipliers
4. the sum of the relative errors in the multipliers
According to the principle of homogeneity of dimensions
1. we can add or subtract any physical quantities
2. we can add or subtract any physical quantities
3. we can add or subtract similar physical quantities
4. we can subtract similar physical quantities
The units of pressure are the same as the units of
1. stress
2. plasticity
3. strain
4. elasticity
How many meters does a vehicle moving with a speed of 18 km h−1h−1 covers in 1 s
1. 4.5
2. 5.0
3. 4
4. 6
0
0

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