Physics - Online Test
Q1. The work done by the force is defined to be
Answer : Option C
Explaination / Solution:
Work done is given by
W = (Fcos)d
here Fcos is the component of applied force in direction of displacement and d is magnitude of displacement.
Q2. Transducer is a device that
Answer : Option B
Explaination / Solution:
Any device which converts energy from one form to another is called a transducer.It converts variation in physical quantities such as pressure,dispalcement,force,temprature etc.Like microphone converts sound signal into an electrical signal.
Q3.
Multiplying a vector by a negative real number
Answer : Option C
Explaination / Solution:
If a vector is multiplied by a negative number (for example -2, -3 ,-5, -60 unit etc.) or a scalar not only its magnitude is changed but its direction also reversed.
Q4. Two positive charges
Answer : Option B
Explaination / Solution:
Acc to coulomb's law unlike charges always attract each other while like charges always repel each other so between two positive charges repulsion is working.
Q5. The S.I unit of stress is
Answer : Option A
Explaination / Solution:
No Explaination.
Q6. Zeroth Law of Thermodynamics
Answer : Option C
Explaination / Solution:
The zeroth law of thermodynamics states that if twothermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.
More simply:
if
It is called the zeroth (0th) law of thermodynamics because it was discovered after the others, but people thought it was more important so they wanted to give it a number before the other laws.
Q7. A scientific theory is accepted if
Answer : Option C
Explaination / Solution:
A scientific theory is an explanation of some aspect of the natural world that can, in accordance with the scientific method, be repeatedly tested, using a predefined protocol of observations and experiments.Established scientific theories have withstood rigorous scrutiny and are a comprehensive form of scientific knowledge.
Q8. In Geiger-Marsden experiment, at the point of closest approach
Answer : Option D
Explaination / Solution:
No Explaination.
Q9. Force is a
Answer : Option D
Explaination / Solution:
Newton's second law of motion gives the quantitative definition of force. The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
Q10. Phasor diagrams show
Answer : Option D
Explaination / Solution:
By convention phasor diagrams are made to show the rotation of phasor in counterclockwise direction with constant speed
