**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**