Physics - Online Test
Q1. If F is a force and d is the displacement in the direction of force then the work done by the force is given by
Answer : Option C
Explaination / Solution:
Work done = force in the direction of displacement multiplied by displacement
Q2. Which of these can be used to convert position signals to electrical signals?
Answer : Option B
Explaination / Solution:
Potentiometer is device which can be used to measure and control frequency,temprature etc.Hence changing frequency in signal coverts it into electrical signal.
Q3. To find the sum of vectors A and B, we place vector B
Answer : Option A
Explaination / Solution:
Triangle law of vector addition states that when two vectors are represented by two sides of a triangle in magnitude and direction taken in same order then third side of that triangle represents in magnitude and direction the resultant of the vectors.
Taken in same order mean tail of Vector B must coincide with head of vector A as shown in image.
Q4. Charge is quantized means
Answer : Option B
Explaination / Solution:
Total charge transferred from one body to other can be calculated by the number of electrons it is known as quantisation of charge given by q=±ne, where n= number of electrons , which should be an integer.
Q5.
If a wire has an initial length L and becomes L + on application of force, the longitudinal strain is given by
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. Internal energy of a system
Answer : Option D
Explaination / Solution:
In thermodynamics, the internal energy of a system is the energy contained within the system. It is the energy in a system arising from the relative positions and interactions of its parts.
Q7. A scientific theory
Answer : Option D
Explaination / Solution:
A scientific theory is not the end result of the scientific method; theories can be proven or rejected, just like hypotheses. Theories can be improved or modified as more information is gathered so that the accuracy of the prediction becomes greater over time.
Q8. In Geiger-Marsden experiment, actual results was
Answer : Option D
Explaination / Solution:
No Explaination.
Q9. Second law in terms of momentum p and mass m is
Answer : Option B
Explaination / Solution:
Applied force is directly proportional to rate of change of momentum.
Q10. Average power supplied to an inductor over one complete cycle
Answer : Option B
Explaination / Solution:
In the first half of the cycle, power is supplied to the inductive circuit. In the next half the inductor dissipates the energy supplied by circuit.
Thus overall no power is supplied to the circuit
