Physics - Online Test
Q1. The scientific method is
Answer : Option A
Explaination / Solution:
The scientific method is a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry is commonly based on empirical or measurable evidence subject to specific principles of reasoning.
Q2. The scalar product of two vectors A and B in terms of the projections of the vectors on the x, y and z axis is
Answer : Option C
Explaination / Solution:
A = Ax i+ Ay j+ Azk
B = Bx i+ By j+ Bzk
A. B = (Ax i+ Ay j+ Azk). ( Bx i+ By j+ Bzk)
A. B = AxBx + AyBy + AzBz
Q3. Electronic communication is not possible if
Answer : Option A
Explaination / Solution:
As the information or message is transmitted from the source to the receiver ,it is first converted into electrical signal which is then transmiited through the communication medium.Hence in electrical communication it is must to convert raw message or information into electrical signal.Else the electronic messages will not be transmitted.
Q4. Magnitude of displacement of a particle is
Answer : Option C
Explaination / Solution:
The maximum possible value for displacement is the distance travelled, so it cannot be of a greater value than distance (path length).
The magnitude of the displacement is always less than or equal to the distance traveled. If two displacements in the same direction are added, then the magnitude of their sum will be equal to the distance traveled.
Q5. Thermodynamic state of a system is an equilibrium state
Answer : Option D
Explaination / Solution:
In thermodynamic equilibrium there are no net macroscopic flows of matter or of energy, either within a system or between systems.
Q6. Electric charge
Answer : Option C
Explaination / Solution:
Every matter is made up of atoms which contains protons, electrons and neutrons.
Protons are +ve charged particles and electrons are - ve charged particles.
Because of electric charge these particles experience a force in electrical fields.
Q7. The importance of the elastic behavior of materials is
Answer : Option D
Explaination / Solution:
More the elastic a material is , more it has the property to regain its original position which is required in construction works.
Q8. In Geiger-Marsden experiment very small deflection of the beam was expected because
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Inertia refers to
Answer : Option B
Explaination / Solution:
Inertia is the resistance of any physical object to any change in its state of motion; this includes changes to its speed, direction, or state of rest. It is the tendency of objects to keep moving in a straight line at constant velocity. Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
Q10. Alternating current is so called because
Answer : Option D
Explaination / Solution:
Alternating Current is the current in which the polarity of source continuously changes on a fixed frequency. So the positive and the negative terminals ‘alternate’
