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**Quiz Description** :

**Name: **Order of magnitude : Physics Quiz

**Subject: **Physics

**Topic: **Order of magnitude

**Questions: **8 MCQ

**Time Allowed: **12 minutes

**Important for: **IIT JEE, UPSEE, WBJEE Engineering Entrance exams, AIPMT and other PMT entrance test, +2 school students and B. Sc. / M. Sc. College Students.

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- Question 1 of 8
##### 1. Question

1 pointsA number is expressed as a × 10

^{b}. The order of magnitude of this number isCorrectGiven number = a × 10

^{b}

We know that as the order of magnitude is the exponent of 10, therefore order of magnitude of the given number is ‘b’IncorrectGiven number = a × 10

^{b}

We know that as the order of magnitude is the exponent of 10, therefore order of magnitude of the given number is ‘b’ - Question 2 of 8
##### 2. Question

1 pointsIf electrostatic force between two charged particles is 4.3 × 10

^{-5}N, then the order of magnitude of this electrostatic force isCorrectGiven that: The electrostatic force = 4.3 × 10

^{-5}N.

We know that as the order of magnitude is the exponent of 10, therefore order of magnitude of the electrostatic force is -5.IncorrectGiven that: The electrostatic force = 4.3 × 10

^{-5}N.

We know that as the order of magnitude is the exponent of 10, therefore order of magnitude of the electrostatic force is -5. - Question 3 of 8
##### 3. Question

1 pointsIf the diameter of sun is 1.39 × 10

^{9}m, then diameter of sun is of the order ofCorrectGiven that the diameter of the sun = 1.39 × 10

^{9}m.

We know that the round off number 1.39 is 1, because it is less than 5.

Therefore diameter of the sun is the order is 10^{9}m.IncorrectGiven that the diameter of the sun = 1.39 × 10

^{9}m.

We know that the round off number 1.39 is 1, because it is less than 5.

Therefore diameter of the sun is the order is 10^{9}m. - Question 4 of 8
##### 4. Question

1 pointsIf diameter of hydrogen atom is 1.06 × 10

^{-10}m, then its diameter is of the order ofCorrectGiven that the diameter of hydrogen atom = 1.06 × 10

^{-10}m.

We know that the round off number 1.06 is 1, because it is less than 5.

Therefore the diameter of hydrogen atom is of the order of 10^{-10}.IncorrectGiven that the diameter of hydrogen atom = 1.06 × 10

^{-10}m.

We know that the round off number 1.06 is 1, because it is less than 5.

Therefore the diameter of hydrogen atom is of the order of 10^{-10}. - Question 5 of 8
##### 5. Question

1 pointsIf mass of the electron is 9.11 × 10

^{-31}kg, then its mass is of the order ofCorrectGiven that the mass of electron = 9.11 Given that the mass of electron = 9.11 × 10

^{-31}kg.

We know that the round off number of 9.11 is 10, because it is greater than 5.

Therefore order of the given number is 10^{5}.IncorrectGiven that the mass of electron = 9.11 Given that the mass of electron = 9.11 × 10

^{-31}kg.

We know that the round off number of 9.11 is 10, because it is greater than 5.

Therefore order of the given number is 10^{5}. - Question 6 of 8
##### 6. Question

1 pointsThe order of number 87962 is

CorrectGiven that the number is 87962. The given number may be written as 8.7962 × 10

^{4}.

We know that the round off number 8.7962 is 9, because it is greater than 5.

Therefore order of the given number is 10^{5}.IncorrectGiven that the number is 87962. The given number may be written as 8.7962 × 10

^{4}.

We know that the round off number 8.7962 is 9, because it is greater than 5.

Therefore order of the given number is 10^{5}. - Question 7 of 8
##### 7. Question

1 pointsThe order of (2)

^{10}is approximatelyCorrectThe given number is = (2)

^{10}.

We know that (2)^{10}= 1024 = 1.024 × 10^{3}.

We also know that the round off 1.024 is 1, because it is less than 5.

Therefore order of the given number is 10^{3}.IncorrectThe given number is = (2)

^{10}.

We know that (2)^{10}= 1024 = 1.024 × 10^{3}.

We also know that the round off 1.024 is 1, because it is less than 5.

Therefore order of the given number is 10^{3}. - Question 8 of 8
##### 8. Question

1 pointsTime-taken by sunlight to penetrate a window pan of 3 mm think is of the order of [Consider speed of light (c) = 3 × 10

^{8}m-s^{-1}]CorrectGiven that the thickness of window pan (x) = 3 mm = 3 × 10

^{-3}m and speed of light (c) = 3 × 10^{8}m-s^{-1}.

We know that time taken by sunlight to penetrate the window pan

(t) = x / c = 3 × 10^{-3 }/ 3 × 10^{8}= 1 × 10^{-11}s.

Therefore time-taken is of the order of 10^{-11}s.IncorrectGiven that the thickness of window pan (x) = 3 mm = 3 × 10

^{-3}m and speed of light (c) = 3 × 10^{8}m-s^{-1}.

We know that time taken by sunlight to penetrate the window pan

(t) = x / c = 3 × 10^{-3 }/ 3 × 10^{8}= 1 × 10^{-11}s.

Therefore time-taken is of the order of 10^{-11}s.