Physics and Mathematics Obj-1 (MCQ-1) HC Verma Solutions Ch-2 Vol-1 Concept of Physics for Class-11. Solution of Objective -1 (MCQ-1) Questions of Ch-2 Physics and Mathematics (Concept of Physics) .Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

## Physics and Mathematics Obj-1 (MCQ-1) HC Verma Solutions Vol-1 Ch-2

 Board ISC and other board Publications Bharti Bhawan Publishers Chapter-2 Physics and Mathematics Class 11 Vol 1st writer H C Verma Book Name Concept of Physics Topics Solution of Objective-1 (MCQ-1) Questions Page-Number 28

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### Physics and Mathematics Obj-1 (MCQ-1) HC Verma Solutions Vol-1 Ch-2

(page-28)

#### Question 1:

A vector is not changed if
(a) it is rotated through an arbitrary angle
(b) it is multiplied by an arbitrary scalar
(c) it is cross multiplied by a unit vector
(d) it is slid parallel to itself.

The option (d) it is slid parallel to itself. is correct

Explanation:

A vector is defined by its magnitude and direction. If we slide it to a parallel position to itself, then none of the given parameters, which define the vector, will change.

Let the magnitude of a displacement vector (𝐴 ) directed towards the north be 5 metres. If we slide it parallel to itself, then the direction and magnitude will not change.

#### Question 2:

Which of the sets given below may represent the magnitudes of three vectors adding to zero?
(a) 2, 4, 8
(b) 4, 8, 16
(c) 1, 2, 1
(d) 0.5, 1, 2

The option (c) 1, 2, 1 is correct

Explanation:

1,2 and 1 may represent the magnitudes of three vectors adding to zero.For example one of the vector of length 1 should make an angle of

135°with x axis and the other vector of length 1 makes an angle of 225°with x axis. The third vector of length 2 should lie along x axis.

#### Question 3:

The resultant of  𝐴⃗  and 𝐵⃗makes an angle α with A⃗  and β with B⃗  ,

(a) α < β
(b) α < β if A < B
(c) α < β if A > B
(d) α < β if A = B

The option  (c) α < β if A > B is correct

Explanation:

The resultant of two vectors is closer to the vector with the greater magnitude.
Thus, α < β if A > B

#### Question 4:

The component of a vector is
(a) always less than its magnitude
(b) always greater than its magnitude
(c) always equal to its magnitude
(d) None of these.

The option  (d) None of these. is correct

Explanation:

All the given options are incorrect. The component of a vector may be less than, greater than or equal to its magnitude, depending upon the vector and its components.

#### Question 5:

A vector  𝐴   points vertically upward and  B ⃗   points towards the north. The vector product  𝐴 ⃗  ×  B

(a) along the west
(b) along the east
(c) zero
(d) vertically downward.

The option  (a) along the west. is correct

Explanation:

The vector product

𝐴   ×  B ⃗  will point towards the west. We can determine this direction using the right hand thumb rule.

#### Question 6:

The radius of a circle is stated as 2.12 cm. Its area should be written as
(a) 14 cm2
(b) 14.1 cm2
(c) 14.11 cm2
(d) 14.1124 cm2

The option (b) 14.1 cmis correct

Explanation:

Area of a circle, A=  πr2 On putting the values, we get:

The rules to determine the number of significant digits says that in the multiplication of two or more numbers, the number of significant digits in the answer should be equal to that of the number with the minimum number of significant digits. Here, 2.12 cm has a minimum of three significant digits. So, the answer must be written in three significant digits.

—: End of Physics and Mathematics Obj-1 (MCQ-1) HC Verma Solutions Ch-2 :–

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