78 + Interview Questions in Motion In A Plane in Physics

51.	Unit vector along the vector 4î + 3&jcirc; is _____(a) (4î + 3&jcirc;)/5(b) 4î + 3&jcirc;(c) (4î + 3&jcirc;)/6(d) (4î + 3&jcirc;)/10I had been asked this question during a job interview.This is a very interesting question from Vector Addition topic in portion Motion in a Plane of Physics – Class 11
Answer» RIGHT option is (a) (4î + 3&jcirc;)/5 For explanation: Unit vector along 4î + 3&jcirc; , is obtained by dividing the PRESENT vector by its magnitude. The magnitude of the given vector is 5. HENCE, the required unit vector is (4î + 3&jcirc;)/5.

Discussion

52.	A body moves from point A (3,6) to point B (11,12) to point C (15,15). What is the average speed of the body along the given path if the total time taken is 100s?(a) 0.15 units/s(b) 1.5 units/s(c) 15 units/s(d) 0.0015 units/sI have been asked this question in a national level competition.My question is based upon Motion in a Plane with Constant Acceleration in portion Motion in a Plane of Physics – Class 11
Answer» CORRECT option is (a) 0.15 units/s Best explanation: The distance between A and B is 10 units. The distance between B and C is 5 units. HENCE, the total distance is 15 units. The total time taken is 100 s. Average SPEED = total distance/total time taken = 15/100 = 0.15 units/s.

Discussion

53.	When two vectors in the same direction are added, the magnitude of resulting vector is equal to _______(a) Sum of magnitudes of the vectors(b) Difference of magnitudes of the vectors(c) Product of magnitudes of the vectors(d) Sum of the roots of magnitudes of the vectorsThe question was asked in homework.My question is taken from Vector Addition topic in portion Motion in a Plane of Physics – Class 11
Answer» Right option is (a) Sum of MAGNITUDES of the vectors Best explanation: Consider the GRAPHICAL REPRESENTATION of these two vectors. When one vector is added to the other in the same direction, the lengths will be added. The resultant vector will bear the resultant length. Length is the magnitude of the vector. HENCE the magnitudes add to give the magnitude of the resultant vector.

Discussion

54.	A car travels 5m in X direction and then 7m in Y direction. What is the final vector position of the car with respect to the origin?(a) 5î + 7&jcirc;(b) 7î + 5&jcirc;(c) 7î + 7&jcirc;(d) 5î + 5&jcirc;The question was asked in an internship interview.I would like to ask this question from Motion in a Plane in section Motion in a Plane of Physics – Class 11
Answer» The CORRECT answer is (a) 5î + 7&jcirc; To EXPLAIN I would say: UNIT vector along X is î and that along Y is &jcirc;. Hence, when the car travels 5m in X direction and 7m in y direction, the final position BECOMES 5î + 7&jcirc;.

Discussion

55.	A force vector (50 N) is making and angle of 30 degrees with X axis has a vertical component of magnitude ___(a) 25(b) 55(c) 50(d) 100/√3I got this question in examination.The above asked question is from Motion in a Plane in chapter Motion in a Plane of Physics – Class 11
Answer» The correct OPTION is (a) 25 The best explanation: The vertical component of any VECTOR with magnitude a is a sin θ. Here θ = 60. sin θ = ½. HENCE the answer is 50/2 = 25 N.

Discussion

56.	A vector can be resolved along ______(a) Only one direction(b) Only two directions(c) Only three directions(d) Only in independent directionsThis question was addressed to me by my college professor while I was bunking the class.Asked question is from Motion in a Plane in division Motion in a Plane of Physics – Class 11
Answer» RIGHT choice is (d) Only in INDEPENDENT DIRECTIONS Explanation: A VECTOR can be resolved in number of components. But, the number of components has to be equal to the number of independent directions available. It can only be resolved into independent directions no MATTER how many they are.

Discussion

57.	The vector obtained by addition of two vectors is termed as ______(a) New vector(b) Resultant vector(c) Derived vector(d) Sum vectorThe question was asked in class test.Question is taken from Motion in a Plane in portion Motion in a Plane of Physics – Class 11
Answer» CORRECT ANSWER is (b) Resultant vector For explanation: The resultant vector is the vector which is obtained by the addition or SUBTRACTION of two VECTORS. The resultant vector can either be calculated by using the graphical method or the analytical method.

Discussion

58.	What happens when a vector is multiplied by a scalar?(a) Its magnitude gets multiplied by that much amount(b) Its direction rotates in XY plane by that much angle(c) Its direction rotates in YZ plane by that much angle(d) Its direction rotates in ZX plane by that much angleI have been asked this question in an internship interview.I need to ask this question from Motion in a Plane in chapter Motion in a Plane of Physics – Class 11
Answer» Correct option is (a) Its magnitude gets multiplied by that much amount Best explanation: Any vector a, can be written as a = &VERT;a\|(\(\widehat{unit vector}\)). Hence, when we MULTIPLY it by a SCALAR, the magnitude MULTIPLIES by that much amount.

Discussion

59.	Which one of the following operations is valid?(a) Vector multiplied by scalar(b) Vector added to scalar(c) Vector subtracted from scalar(d) Vector divided by vectorI got this question in examination.This interesting question is from Motion in a Plane in portion Motion in a Plane of Physics – Class 11
Answer» Correct option is (a) Vector multiplied by scalar To elaborate: Only operations valid for vector with scalars are multiplication and DIVISION. A vector can be multiplied or DIVIDED by a scalar. Other operations like addition and SUBTRACTION are not valid for vectors with scalars.

Discussion

60.	What is a vector quantity?(a) A quantity with only magnitude(b) A quantity with only direction(c) A quantity with both magnitude and direction(d) A quantity without directionThe question was posed to me during an online exam.My question is taken from Motion in a Plane topic in section Motion in a Plane of Physics – Class 11
Answer» Right CHOICE is (c) A quantity with both magnitude and direction To elaborate: A vector quantity is one which has both magnitude and direction. Unlike SCALARS, it can also tell the direction in which is the entity is acting. Examples of vector QUANTITIES are force, velocity, DISPLACEMENT ETC.

Discussion

61.	Dividing 5î + 10&jcirc; by 5 gives ______(a) î + 2&jcirc;(b) î + 4&jcirc;(c) î + &jcirc;(d) 2î + &jcirc;,This question was addressed to me in semester exam.My doubt is from Motion in a Plane in section Motion in a Plane of Physics – Class 11
Answer» CORRECT CHOICE is (a) î + 2&jcirc; Best explanation: When 5î + 10&jcirc; is DIVIDED by 5, both the components get divided by 5. Hence, the answer is î + 2&jcirc;.

Discussion

62.	Mass is a ____(a) Scalar quantity(b) Vector quantity(c) Relative quantity(d) Dependent quantityI got this question during an interview.Query is from Motion in a Plane topic in portion Motion in a Plane of Physics – Class 11
Answer» RIGHT option is (a) Scalar quantity For EXPLANATION: MASS REPRESENTS the amount of MATTER in a body. It does not have any direction but only mass. Hence, it is a scalar quantity.

Discussion

63.	The operation used to obtain a scalar from two vectors is ______(a) Cross product(b) Dot product(c) Simple product(d) Complex productThe question was posed to me by my school teacher while I was bunking the class.This intriguing question comes from Motion in a Plane topic in division Motion in a Plane of Physics – Class 11
Answer» Right choice is (b) Dot product Best explanation: Dot product of TWO vectors gives a SCALAR QUANTITY as the output. Cross product gives a vector as the output. It is also known as scalar product.

Discussion

64.	The operation which does not give you a vector as an output from two vector inputs is ______(a) Dot product(b) Cross product(c) Vector addition(d) Vector subtractionI got this question in semester exam.I want to ask this question from Motion in a Plane in chapter Motion in a Plane of Physics – Class 11
Answer» The correct OPTION is (a) Dot product For explanation I would say: Vector addition and subtraction GIVE a vector as the output. CROSS product also gives a vector as the output. Only Dot product gives a scalar after acting on two VECTORS.

Discussion

65.	A unit vector has the magnitude of ___(a) 5(b) 1(c) 10(d) 0I had been asked this question by my school teacher while I was bunking the class.The query is from Motion in a Plane in portion Motion in a Plane of Physics – Class 11
Answer» Correct option is (b) 1 To elaborate: A unit vector has the magnitude 1. It is used to represent non-unit vectors using along other unit vectors. Any vector can be REPRESENTED as a sum of unit vectors, multiplied by required SCALARS.

Discussion

66.	What is a scalar?(a) A quantity with only magnitude(b) A quantity with only direction(c) A quantity with both magnitude and direction(d) A quantity without magnitudeThis question was addressed to me in an interview.Asked question is from Motion in a Plane in division Motion in a Plane of Physics – Class 11
Answer» Correct answer is (a) A QUANTITY with only MAGNITUDE To elaborate: A scalar quantity is one which only has a magnitude. Examples of scalar quantities are mass, volume, WORK, ENERGY etc.

Discussion

67.	Multiplying 2î + 7&jcirc; by 5 gives ______(a) 10î + 35&jcirc;(b) 2î + 35&jcirc;(c) 10î + 7&jcirc;(d) 2î + 7&jcirc;I have been asked this question in examination.I would like to ask this question from Motion in a Plane in division Motion in a Plane of Physics – Class 11
Answer» Correct CHOICE is (a) 10î + 35&JCIRC; Explanation: When 2î + 7&jcirc; is multiplied by 5, both the components get multiplied by 5. Hence, the answer is 10î + 35&jcirc;.

Discussion

68.	The splitting of a vector into two component vectors is called ______(a) Vector resolution(b) Vector sum(c) Vector decomposition(d) Vector differenceI have been asked this question in exam.The doubt is from Motion in a Plane topic in portion Motion in a Plane of Physics – Class 11
Answer» Right option is (a) Vector RESOLUTION The explanation: The splitting of a vector into two component VECTORS is CALLED vector resolution. The vector can be resolved into as many COMPONENTS as there are independent directions.

Discussion

69.	A vector is represented as 4î + 3&jcirc;. What is its magnitude?(a) 5(b) 10(c) 4(d) 3The question was posed to me during an interview for a job.This interesting question is from Motion in a Plane topic in chapter Motion in a Plane of Physics – Class 11
Answer» Correct answer is (a) 5 Easiest explanation: The magnitude of any vector can be FOUND by TAKING the SQUARE root of SUM of the SQUARES of its two components. Hence, the sum of the squares of components is equal to 4^2 + 3^2 = 25. Square root of 25 = 5. Hence, the answer is 5.

Discussion

70.	Eleven times unit vector along X added to 7 times unit vector along Y gives ______(a) 11î + 7&jcirc;(b) 7î + 11&jcirc;(c) 7î + 7&jcirc;(d) 11î + 11&jcirc;This question was posed to me in a job interview.Enquiry is from Motion in a Plane in section Motion in a Plane of Physics – Class 11
Answer» RIGHT option is (a) 11î + 7&JCIRC; Explanation: Unit vector along X is î and that along Y is &jcirc;. Hence, ELEVEN times unit vector along X added to 7 times unit vector along Y will give 11î + 7&jcirc;.

Discussion

71.	A velocity vector (5m/s) is making and angle of 60 degrees with X axis has a horizonal component of magnitude ___(a) 2.5(b) 5.5(c) 5(d) 10/√3This question was posed to me in a job interview.This intriguing question originated from Motion in a Plane topic in chapter Motion in a Plane of Physics – Class 11
Answer» The correct answer is (a) 2.5 Easy explanation: The HORIZONTAL component of any vector with magnitude a is a COS θ. Here θ = 60. cos θ = ½. HENCE the answer is 5/2 = 2.5 m/s.

Discussion

72.	What is the standard form for the resolution of a vector having magnitude ‘a’ and is inclined at an angle θ to the X axis?(a) a(cos θ î + sin θ &jcirc;)(b) a(sin θ î + cos θ &jcirc;)(c) a(sin θ î + sin θ &jcirc;)(d) a(cos θ î + cos θ &jcirc;)This question was addressed to me in an internship interview.This interesting question is from Motion in a Plane topic in portion Motion in a Plane of Physics – Class 11
Answer» CORRECT answer is (a) a(cos θ î + SIN θ &jcirc;) For explanation: The correct answer is a(cos θ î + sin θ &jcirc;). This is obtained by CONSTRUCTING a right-angled triangle with the distance of the point from the origin with either of the axes and then finding out the CORRESPONDING VALUES for X and Y components.

Discussion

73.	Subtracting 2î + 7&jcirc; from î + &jcirc; gives ______(a) -î – 6&jcirc;(b) 3î + 8&jcirc;(c) î + 6&jcirc;(d) 7&jcirc;This question was addressed to me in exam.My doubt is from Vector Addition topic in chapter Motion in a Plane of Physics – Class 11
Answer» Right CHOICE is (a) -î – 6&JCIRC; The explanation: When 2î + 7&jcirc; is subtracted from î + &jcirc;, the CORRESPONDING components get subtracted. Hence, the answer is -î – 6&jcirc;.

Discussion

74.	Adding 2î + 7&jcirc; and î + &jcirc; gives ______(a) 3î + 8&jcirc;(b) î + 35&jcirc;(c) î + 8&jcirc;(d) 2î + 7&jcirc;I have been asked this question in an interview.This key question is from Vector Addition topic in portion Motion in a Plane of Physics – Class 11
Answer» The CORRECT choice is (a) 3î + 8&JCIRC; To EXPLAIN I would say: When 2î + 7&jcirc; is added to î + &jcirc;, the corresponding components get added. Hence, the ANSWER is 3î + 8&jcirc;.

Discussion

75.	On adding two vectors we get _____(a) A vector(b) A scalar(c) A number(d) An operationI got this question in homework.My doubt is from Vector Addition topic in section Motion in a Plane of Physics – Class 11
Answer» The CORRECT answer is (a) A vector The EXPLANATION is: Addition of TWO vectors gives a vector as the result. The same goes for SUBTRACTION and cross MULTIPLICATION. It is only when two vectors are operated through dot product, we get a scalar as the result.

Discussion

76.	What is the resolved form for a vector which is 5 units in long and is inclined at an angle of 45 degrees to the X axis?(a) \(\frac{1}{\sqrt{2}}\hat{i} + \frac{1}{\sqrt{2}}\hat{j}\)(b) \(\frac{5}{\sqrt{2}}\hat{i} + \frac{5}{\sqrt{2}}\hat{j}\)(c) \(\frac{5}{\sqrt{2}}\hat{i} + \frac{15}{\sqrt{2}}\hat{j}\)(d) \(\frac{10}{\sqrt{2}}\hat{i} + \frac{10}{\sqrt{2}}\hat{j}\)I have been asked this question in my homework.Question is from Motion in a Plane topic in division Motion in a Plane of Physics – Class 11
Answer» RIGHT option is (B) \(\frac{5}{\sqrt{2}}\hat{i} + \frac{5}{\sqrt{2}}\hat{j}\) To EXPLAIN I would SAY: The standard for is a(cos θ î + sin θ &jcirc;). Here, a = 5, and θ = 45 degrees. When we substitute this in the equation, we get, the resolved VECTOR as \(\frac{5}{\sqrt{2}}\hat{i} + \frac{5}{\sqrt{2}}\hat{j}\).

Discussion

77.	What is the result when î + 14&jcirc; is multiplied by √49?(a) 7î + 98&jcirc;(b) 98î + 14&jcirc;(c) 7î + 98&jcirc;(d) (î + 7&jcirc;)*√49This question was posed to me in semester exam.I would like to ask this question from Motion in a Plane topic in section Motion in a Plane of Physics – Class 11
Answer» Right option is (a) 7î + 98&JCIRC; Explanation: \(\sqrt{49}\) = 7. When î + 14&jcirc; is multiplied by 7, we get 7î + 98&jcirc; as the ANSWER. Hence, 7î + 98&jcirc; is the correct answer.

Discussion

78.	Adding î + 77&jcirc; and 7î + &jcirc; gives ______(a) 8î + 78&jcirc;(b) 0î + 76&jcirc;(c) î + 74&jcirc;(d) 78î + 8&jcirc;I had been asked this question in an interview for job.This interesting question is from Vector Addition topic in portion Motion in a Plane of Physics – Class 11
Answer» The correct CHOICE is (a) 8î + 78&jcirc; EXPLANATION: When î + 77&jcirc; is ADDED to 7î + &jcirc;, the corresponding components get added. HENCE, the ANSWER is 8î + 78&jcirc;.

Discussion

Explore topic-wise InterviewSolutions in .

A force vector (50 N) is making and angle of 30 degrees with X axis has a vertical component of magnitude ___(a) 25(b) 55(c) 50(d) 100/√3I got this question in examination.The above asked question is from Motion in a Plane in chapter Motion in a Plane of Physics – Class 11

The vector obtained by addition of two vectors is termed as ______(a) New vector(b) Resultant vector(c) Derived vector(d) Sum vectorThe question was asked in class test.Question is taken from Motion in a Plane in portion Motion in a Plane of Physics – Class 11

Dividing 5î + 10&jcirc; by 5 gives ______(a) î + 2&jcirc;(b) î + 4&jcirc;(c) î + &jcirc;(d) 2î + &jcirc;,This question was addressed to me in semester exam.My doubt is from Motion in a Plane in section Motion in a Plane of Physics – Class 11

Mass is a ____(a) Scalar quantity(b) Vector quantity(c) Relative quantity(d) Dependent quantityI got this question during an interview.Query is from Motion in a Plane topic in portion Motion in a Plane of Physics – Class 11

A unit vector has the magnitude of ___(a) 5(b) 1(c) 10(d) 0I had been asked this question by my school teacher while I was bunking the class.The query is from Motion in a Plane in portion Motion in a Plane of Physics – Class 11

Multiplying 2î + 7&jcirc; by 5 gives ______(a) 10î + 35&jcirc;(b) 2î + 35&jcirc;(c) 10î + 7&jcirc;(d) 2î + 7&jcirc;I have been asked this question in examination.I would like to ask this question from Motion in a Plane in division Motion in a Plane of Physics – Class 11

The splitting of a vector into two component vectors is called ______(a) Vector resolution(b) Vector sum(c) Vector decomposition(d) Vector differenceI have been asked this question in exam.The doubt is from Motion in a Plane topic in portion Motion in a Plane of Physics – Class 11

A vector is represented as 4î + 3&jcirc;. What is its magnitude?(a) 5(b) 10(c) 4(d) 3The question was posed to me during an interview for a job.This interesting question is from Motion in a Plane topic in chapter Motion in a Plane of Physics – Class 11

Eleven times unit vector along X added to 7 times unit vector along Y gives ______(a) 11î + 7&jcirc;(b) 7î + 11&jcirc;(c) 7î + 7&jcirc;(d) 11î + 11&jcirc;This question was posed to me in a job interview.Enquiry is from Motion in a Plane in section Motion in a Plane of Physics – Class 11

Subtracting 2î + 7&jcirc; from î + &jcirc; gives ______(a) -î – 6&jcirc;(b) 3î + 8&jcirc;(c) î + 6&jcirc;(d) 7&jcirc;This question was addressed to me in exam.My doubt is from Vector Addition topic in chapter Motion in a Plane of Physics – Class 11

Adding 2î + 7&jcirc; and î + &jcirc; gives ______(a) 3î + 8&jcirc;(b) î + 35&jcirc;(c) î + 8&jcirc;(d) 2î + 7&jcirc;I have been asked this question in an interview.This key question is from Vector Addition topic in portion Motion in a Plane of Physics – Class 11

On adding two vectors we get _____(a) A vector(b) A scalar(c) A number(d) An operationI got this question in homework.My doubt is from Vector Addition topic in section Motion in a Plane of Physics – Class 11

Adding î + 77&jcirc; and 7î + &jcirc; gives ______(a) 8î + 78&jcirc;(b) 0î + 76&jcirc;(c) î + 74&jcirc;(d) 78î + 8&jcirc;I had been asked this question in an interview for job.This interesting question is from Vector Addition topic in portion Motion in a Plane of Physics – Class 11