Physics-
General
Easy
Question
In Millikan's experiment for the determination of the charge on the electron, the reason for using the oil is
- It is a lubricant
- Its density is higher
- It vapourises easily
- It does not vapourise
The correct answer is: It does not vapourise
In Millikan's experiment, drops of non-volatile liquid (cloak oil) are used to prevent evaporation.
Related Questions to study
Physics-
If A and B are identical bulbs which bulbs glows brighter
If A and B are identical bulbs which bulbs glows brighter
Physics-General
Physics-
Following figure shows an ac generator connected to a "block box" through a pair of terminals. The box contains possible R, L, C or their combination, whose elements and arrangements are not known to us. Measurements outside the box reveals that
e = 75 sin (sin 
t) volt, i = 1.5 sin ( t + 45o) amp then, the wrong statement is
Following figure shows an ac generator connected to a "block box" through a pair of terminals. The box contains possible R, L, C or their combination, whose elements and arrangements are not known to us. Measurements outside the box reveals that
e = 75 sin (sin t) volt, i = 1.5 sin ( t + 45o) amp then, the wrong statement is
Physics-General
Physics-
Which of the following plots may represent the reactance of a series LC combination
Which of the following plots may represent the reactance of a series LC combination
Physics-General
Physics-
The graphs given below depict the dependence of two reactive impedances X1 and X2 on the frequency of the alternating e.m.f. applied individually to them. We can then say that
The graphs given below depict the dependence of two reactive impedances X1 and X2 on the frequency of the alternating e.m.f. applied individually to them. We can then say that
Physics-General
Physics-
The resonance point in 
and 
curves is
The resonance point in and curves is
Physics-General
Physics-
The vector diagram of current and voltage for a circuit is as shown. The components of the circuit will be
The vector diagram of current and voltage for a circuit is as shown. The components of the circuit will be
Physics-General
Physics-
The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current
The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current
Physics-General
Physics-
Two sinusoidal voltages of the same frequency are shown in the diagram. What is the frequency, and the phase relationship between the voltages
Frequency in Hz Phase lead of N over M in radians</span
Two sinusoidal voltages of the same frequency are shown in the diagram. What is the frequency, and the phase relationship between the voltages
Frequency in Hz Phase lead of N over M in radians</span
Physics-General
Physics-
When an ac source of e.m.f. 
is connected across a circuit, the phase difference between the e.m.f. e and the current i in the circuit is observed to be 
, as shown in the diagram. If the circuit consists possibly only of RC or LC in series, find the relationship between the two elements [IIT-JEE (Screening) 2003]
When an ac source of e.m.f. is connected across a circuit, the phase difference between the e.m.f. e and the current i in the circuit is observed to be , as shown in the diagram. If the circuit consists possibly only of RC or LC in series, find the relationship between the two elements [IIT-JEE (Screening) 2003]
Physics-General
Physics-
The current 'i' in an inductance coil varies with time 't' according to following graph
Which one of the following plots shows the variations of voltage in the coil
The current 'i' in an inductance coil varies with time 't' according to following graph
Which one of the following plots shows the variations of voltage in the coil
Physics-General
Physics-
The output current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is
The output current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is
Physics-General
Physics-
A constant voltage at different frequencies is applied across a capacitance C as shown in the figure. Which of the following graphs
Correctly depicts the variation of current with frequency ?
A constant voltage at different frequencies is applied across a capacitance C as shown in the figure. Which of the following graphs
Correctly depicts the variation of current with frequency ?
Physics-General
Physics-
The r.m.s. voltage of the wave form shown is
The r.m.s. voltage of the wave form shown is
Physics-General
Physics-
The figure shows variation of R, XL and XC with frequency f in a series L, C, R circuit. Then for what frequency point, the circuit is inductive
The figure shows variation of R, XL and XC with frequency f in a series L, C, R circuit. Then for what frequency point, the circuit is inductive
Physics-General
Physics-
The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit is as shown in fig. Which of the following statements is correct
The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit is as shown in fig. Which of the following statements is correct
Physics-General
