Physics - Online Test
Q1. Which of the following is a possible first step in applying the scientific method
Answer : Option A
Explaination / Solution:
The scientific method starts when you ask a question about something that you observe: How, What, When, Who, Which, Why, or Where? For a science fair project some teachers require that the question be something you can measure, preferably with a number. Add image of question 16686
Q2. The scalar product of vectors is
Answer : Option C
Explaination / Solution:
Scalar product is
a) Commutative:
b) Distributive
Q3. Which of these is an example of point to point communication?
Answer : Option C
Explaination / Solution:
In point to point communication,communication occurs over a link between a single transmitter and receiver.Telephony is an example of it as it needs a link between caller and receiver to transmit the information.This link is provided by various media like cable.
Q4. Two vectors are equal if
Answer : Option C
Explaination / Solution:
Equal vectors are vectors that have the same magnitude and the same direction. Equal vectors may start at different positions.
Q5. Adiabatic wall is –
Answer : Option B
Explaination / Solution:
In thermodynamics, an adiabatic wall between two thermodynamic systems does not allow heat or matter to pass across it. In theoretical investigations, it is sometimes assumed that one of the two systems is the surroundings of the other.
Q6. Electric charges are of
Answer : Option C
Explaination / Solution:
Two types
- Positivecharge—deficiency of electrons i.e. if a body loses electrons it will be positive charged.
- Negative charge—excess of electrons i.e. if a body gains electrons it will be negative charged
Q7. When a solid is deformed,
Answer : Option A
Explaination / Solution:
External force permanently distubed the equilibrium position of the interatomic ( or intermolecular ) forces between the particles of solid bodies.
Q8. Which of these statements correctly describe the atomic model according to classical electromagnetic theory ?
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Momentum of a body is
Answer : Option B
Explaination / Solution:
p⃗ =mv⃗
Q10. In a circuit containing Resistance only, voltage and current are
Answer : Option A
Explaination / Solution:
The electrical current that flows through an AC resistance varies sinusoidally with time and is represented by the expression, I(t) = I sin(ωt + θ)
Now by ohm's law, V= IR
So, for the AC circuit, V= IR sin(ωt + θ)
Clearly both V and I have zero phase difference and hen are in phase
