Physics - Mock Test 49

Question 481

Which equation is not dimensionally correct?

A) E=mc2 B) Vf=Vi+at C) S=Vt2 D) S=1/2at2

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Question 482

Dimensional analysis is helpful for?

A) deriving a possible formula B) checking the homogeneity of a physical equation C) verification of laws D) only a and b are correct

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Question 483

ML-1 T-2 is the dimension of?

A) force B) pressure C) momentum D) energy

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Question 484

The dimension of force is?

A) MLT-1 B) MLT-2 C) ML-1T D) ML-1T-2

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Question 485

Smaller the least count of the instrument more is the measurement?

A) accurate B) precise C) accurate and precise D) none of these

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Question 486

Number of significant figures in 0.0173 are?

A) three B) four C) five D) two

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Question 487

A digit zero in a measurement ?

A) may be significant may not significant B) always significant C) always insignificantsig D) significant only if left to a significant figure

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Question 488

In any measurement the significant figures are?

A) all accurately known and all doubtful digits B) only accurately known digits C) only doubtful digits D) all accurately known digits and the first doubuful digit

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Question 489

Random errors can be reduced by?

A) taking zero correction B) comparing the instrument with another more accurate one C) taking mean of several measurement D) all methods explained in a, b and c

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Question 490

The uncertainty in a measurement may occur due to?

A) limitation of an instrument B) natural variation of the object to be measured C) inadequate of technique D) all given in a , b and c

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