Quizr: Physics Quiz#3, MCQs

Physics Quiz#3, MCQs

NOTE: Attempt all Questions to see the Result at the bottom of this page.

The Timer has started 10:00

1)

An ideal gas expands into a vacuum in a rigid vessel. As a result there is:
- A) a change in entropy
- B) a decrease of internal energy
- C) an increase of pressure
- D) a change in temperature
Right Answer is the option "A"

2)

The Stern-Gerlach experiment makes use of:
- A) a strong uniform magnetic field
- B) a strong non-uniform magnetic field
- C) a strong uniform electric field
- D) a strong non-uniform electric field
Right Answer is the option "B"

3)

A large collection of nuclei are undergoing alpha decay. The rate of decay at any instant is proportional to:
- A) the number of undecayed nuclei present at that instant
- B) the time since the decays started
- C) the time remaining before all have decayed
- D) the half-life of the decay
Right Answer is the option "A"

4)

The number of significant figures in 0.00150 is:
- A) 5
- B) 4
- C) 3
- D) 2
Right Answer is the option "C"

5)

A bucket of water is pushed from left to right with increasing speed across a horizontal surface. Consider the pressure at two points at the same level in the water.
- A) It is the same
- B) It is higher at the point on the left
- C) It is higher at the point on the right
- D) At first it is higher at the point on the left but as the bucket speeds up it is lower there
Right Answer is the option "A"

6)

An organ pipe with both ends open is 0.85m long. Assuming that the speed of sound is 340m/s, the frequency of the third harmonic of this pipe is
- A) 200 Hz
- B) 300 Hz
- C) 400 Hz
- D) 600 Hz
Right Answer is the option "D"

7)

The Stern-Gerlach experiment makes use of:
- A) a strong uniform magnetic field
- B) a strong non-uniform magnetic field
- C) a strong uniform electric field
- D) a strong non-uniform electric field
Right Answer is the option "B"

8)

Capacitors C1 and C2 are connected in series. The equivalent capacitance is given by
- A) C1C2/(C1 + C2)
- B) (C1 + C2)/C1C2
- C) 1/(C1 + C2)
- D) C1/C2
Right Answer is the option "A"

9)

If the potential difference across a resistor is doubled:
- A) only the current is doubled
- B) only the current is halved
- C) only the resistance is doubled
- D) only the resistance is halved
Right Answer is the option "A"

10)

During an adiabatic process an object does 100 J of work and its temperature decreases by 5K. During another process it does 25 J of work and its temperature decreases by 5 K. Its heat capacity for the second process is.
- A) 20 J/K
- B) 100 J/K
- C) 15 J/K
- D) 5 J/K
Right Answer is the option "C"