Physics Questions & Answers - Free Online Practice

1,261.

the fig above shows displacement-time graphs for three different motions. which of the following statements is correct?

graph 2 corresponds to the highest velocity

graph 1 corresponds to zero velocity

graph 3 corresponds to a particle moving in the negative x direction

graph 2 corresponds to a particle moving in the positive x direction

View answer & explanation

Correct answer is B

At constant velocity, an object must have a constant speed in a constant direction. Constant direction constrains the object to motion in a straight path thus, a constant velocity means motion in a straight line at a constant speed.

1,262.

In the fig above, M and N are insulated metal spheres in contact. A negatively charged ebonite rod P is I brought near M. When M and N are Separated and the rod is taken away, which of the following statements is correct

both M and N have acquired negative charges

both M and N have acquired positive charges

M has acquired negative charge and N positive charge

N has acquired negative charge and M positive charge

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Correct answer is D

No explanation has been provided for this answer.

1,263.

In the above, a voltage V is applied across the terminals P and Q. The voltage across the 1 ohm resistor is

V/8

V/4

V/3

V/2

View answer & explanation

Correct answer is C

Using the voltage- divider method which states that the output voltage is directly proportional to the input voltage and the ratio of R1 and R2, given by:

$V_{a}$ = $\frac{R_{a}}{R_{T}}\times V_{T}$