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Parallelogram Law of Vectors.
Parallelogram Law of Vectors.
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1)
In the experiment, on finding the weight of a given body bythe parallelogram law of vectors, the student needs to use :
Two pulleys and two weights in all
Three pulleys and two weights in all
Two pulleys and three weights in all
Three pulleys and two weights in all
2)
In the experiment on finding the unknown weight, using the parallelogram law of vectors, the student should :
not lubricate the pulleys and use a woollen thread
not lubricate the pulleys and use a cotton thread
lubricate the pulleys and use a woolen thread
lubricate the pulleys and use a cotton thread
3)
In the experiment on finding the weight of a given body by the parallelogram law of vector, a student observes that he can find the unknown weight by using two equal weights of 100 g each makes an angle 90 degree. The unknown weight is likely to have a value of (nearly) :
102 g wt
100 g wt
141 g wt
500 g wt
4)
Which of the following statements is correct?
Physical quantities, having both magnitude and direction are called vector quantities.
Physical quantities, having only magnitude, are called scalar quantities.
All of these.
Vector quantities obey vector algebra.
5)
Which of the following is a scalar quantity?
Displacement
Speed
Velocity
Weight
6)
Which of the following is a vector quantity?
Electric charge
Mass
Distance
Acceleration
7)
Rectangular components of a vector:
Are perpendicular to each other
Lie on the same plane
Start from the origin of the vector
All of the above
8)
What are the main sources of error in the experiment using Gravesand's apparatus?
Friction in the pulleys.
Weights in the threads.
None of these
Both of these.
9)
Which of the following statements is correct?
Due to friction on the pulleys, the thread junction does not come at rest at same position always.
The friction can be reduced by oiling the pulleys.
Suspended weights are kept free to avoid changes in effective weight due to reaction of board or table.
All of these.
10)
In parallelogram law of vector addition the resultant of the vector is represented by ----------------
None of these
diagonal of the parallelogram
opposite side of the parallelogram
any adjacent side of the parallelogram
