551. Which one is not a branch of physical sciences ?
A. Chemistry
B. Astronomy
C. Geology
D. Biology

552. The number of categories in which physical quantities are divided is_____________?
A. 1
B. 2
C. 3
D. 4

553. How many types of units are in SI ?
A. 1
B. 2
C. 3
D. 4

554. In scientific notation, numbers are expressed in________________?
A. Power of ten
B. Powers of two
C. Reciprocal
D. Decimal

555. 1024 can be written in scientific notation as______________?
A. 1.024×103
B. 2 Raised to power 10
C. 0.000976
D. 1/0.00097

556. Prefix deca represents_______________?
A. 10 Raised to power 1
B. 10 Raised to power 2
C. 10 Raised to power 3
D. 10 Raised to power -1

557. The error in measurement may occur due to_________________?
A. The inexperience of a person
B. The faulty apprentice
C. Inappropriate method
D. Due to all reasons in A, B and C

558. 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 technique
D. All given in A, B and C

559. Random errors can be reduced by_______________?
A. Taking zero correction
B. Comparing the instrument with another more accurate one
C. Taking mean of several measurements
D. All methods explained in A, B and C

560. 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 doubtful digit

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