Explore topic-wise MCQs in Graduate Aptitude Test (GATE).

This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is not an inorganic functional material?

A. Ferroelectric
B. Reverse micelles
C. Magnetic field sensor
D. Light detectors
Answer» C. Magnetic field sensor
2.

 What is relative permittivity?

A. Equal to the absolute permittivity
B. Ratio of actual permittivity to absolute permittivity
C. Ratio of absolute permittivity to actual permittivity
D. Equal to the actual permittivity
Answer» C. Ratio of absolute permittivity to actual permittivity
3.

In order to obtain a high value for capacitance, the permittivity of the dielectric medium should be?

A. Low
B. High
C. Zero
D. Unity
Answer» C. Zero
4.

The insulant between the two plates of a capacitor is called _______

A. Conductor
B. Semi-conductor
C. Dielectric
D. Superconductor
Answer» D. Superconductor
5.

What happens when one material is rubbed against another?

A. The material becomes electrically neutral
B. The material becomes electrically charged
C. The material becomes negatively charged
D. The material becomes positively charged
Answer» C. The material becomes negatively charged
6.

Which, among the following is the correct expression for an electric field?

A. E=F/C
B. E=F*C
C. E=F/Q
D. E=F*Q
Answer» D. E=F*Q
7.

In uniform fields, all points have ________ field strength.

A. Zero
B. Same
C. Infinity
D. Different
Answer» C. Infinity
8.

 A field that spreads outwards in all directions is __________

A. Linear
B. Radial
C. Weak
D. Strong
Answer» C. Weak
9.

Which, among the following, is the field where electric charge experiences a force?

A. Electric field
B. Magnetic field
C. Gravitational field
D. Electric, magnetic or gravitational field
Answer» B. Magnetic field
10.

Which among the following statements is true with regard to electric field lines?

A. Electric field lines always intersect
B. Electric field lines may or may not intersect
C. Electric field lines can be seen
D. Electric field lines never intersect
Answer» E.
11.

Electric field terminates at ________

A. Positive charge
B. Negative charge
C. Neither positive nor negative
D. Both positive and negative
Answer» C. Neither positive nor negative
12.

 Electric field originates at __________

A. Positive charge
B. Negative charge
C. Neither positive nor negative
D. Both positive and negative
Answer» B. Negative charge
13.

 The conventional direction of electric field is ________

A. Positive to negative
B. Negative to positive
C. No specific direction
D. Direction cannot be determined
Answer» B. Negative to positive
14.

 Unit of capacitance is __________

A. Volts
B. Farad
C. Henry
D. Newton
Answer» C. Henry
15.

What is the value of capacitance of a capacitor which has a voltage of 4V and ha 16C of charge?

A. 2F
B. 4F
C. 6F
D. 8F
Answer» C. 6F
16.

Capacitance decreases with _________

A. Increase in distance between the plates
B. Decrease in plate area
C. Decrease in distance between the plates
D. Increase in density of the material
Answer» D. Increase in density of the material
17.

 Capacitance increases with ______

A. Increase in plate area
B. Decrease in plate area
C. Increase in distance between the plates
D. Increase in density of the material
Answer» B. Decrease in plate area
18.

Capacitor preferred when there is a high frequency in the circuits is ______

A. Electrolyte capacitor
B. Mica capacitor
C. Air capacitor
D. Glass capacitor
Answer» C. Air capacitor
19.

 A capacitor consists of___________

A. Two conductors
B. Two semiconductors
C. Two dielectrics
D. Two insulators
Answer» B. Two semiconductors
20.

For very low frequencies, capacitor acts as _______

A. Open circuit
B. Short circuit
C. Amplifier
D. Rectifier
Answer» B. Short circuit
21.

 For high frequencies, capacitor acts as _______

A. Open circuit
B. Short circuit
C. Amplifier
D. Rectifier
Answer» C. Amplifier
22.

Capacitance is directly proportional to__________

A. Area of cross section between the plates
B. Distance of separation between the plates
C. Both area and distance
D. Neither area nor distance
Answer» B. Distance of separation between the plates
23.

Which among the following equations is incorrect?

A. Q=CV
B. Q=C/V
C. V=Q/C
D. C=Q/V
Answer» C. V=Q/C
24.

What will happen to the capacitor when the source is removed?

A. It will not remain in its charged state
B. It will remain in its charged state
C. It will start discharging
D. It will become zero
Answer» C. It will start discharging
25.

Unit of capacitance is___________

A. Volts
B. Farad
C. Henry
D. Newton
Answer» C. Henry
26.

What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge?

A. 2F
B. 4F
C. 6F
D. 8F
Answer» B. 4F
27.

 Air has a dielectric constant of ___________

A. Unity
B. Zero
C. Infinity
D. Hundread
Answer» B. Zero
28.

Capacitors charge and discharge in __________ manner.

A. Linear
B. Constant
C. Square
D. Exponential
Answer» E.
29.

Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.

A. 0.1 sec
B. 0.1 msec
C. 0.01 sec
D. 0.01 msec
Answer» D. 0.01 msec
30.

When the supply frequency increases, what happens to the capacitive reactance in the circuit?

A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
Answer» C. Remains the same
31.

A power factor of a circuit can be improved by placing which, among the following, in a circuit?

A. Inductor
B. Capacitor
C. Resistor
D. Switch
Answer» C. Resistor
32.

What happens to the capacitance when the voltage across the capacitor increases?

A. Decreases
B. Increases
C. Becomes 0
D. No effect
Answer» B. Increases
33.

Calculate the capacitance of a capacitor that stores 40microC of charge and has a voltage of 2V.

A. 20F
B. 20microF
C. 10F
D. 10microF
Answer» C. 10F
34.

What happens to the current flow in a fully charged capacitor?

A. Current flow stops
B. Current flow doubles
C. Current flow becomes half its original value
D. Current flow becomes one-fourth its original value
Answer» B. Current flow doubles
35.

When will capacitor fully charged?

A. When the voltage across its plates is half the voltage from ground to one of its plates
B. When current through the capacitor is a 1/root2 time its value
C. When the supply voltage is equal to the capacitor voltage
D. Never
Answer» D. Never
36.

 When the voltage across a capacitor increases, what happens to the charge stored in it?

A. Increases
B. Decreases
C. Becomes zero
D. Cannot be determined
Answer» B. Decreases
37.

If one plate of a parallel plate capacitor is charged to positive charge the other plate is charged to?

A. Positive
B. Negative
C. Positive or negative
D. Not charged
Answer» C. Positive or negative
38.

What is the voltage across a capacitor at the time of switching, that is, when t=0?

A. Infinity
B. Infinity
C. Cannot be determined
D. 1V
Answer» C. Cannot be determined
39.

If a 2F capacitor has 1C charge, calculate the voltage across its terminals.

A. 0.5V
B. 2V
C. 1.5V
D. 1V
Answer» C. 1.5V
40.

Which among the following expressions relate charge, voltage and capacitance of a capacitor?

A. Q=C/V
B. Q=V/C
C. Q=CV
D. C=Q2V
Answer» D. C=Q2V
41.

Capacitance decreases with __________

A. Increase in distance between the plates
B. Decrease in plate area
C. Decrease in distance between the plates
D. Increase in density of the material
Answer» D. Increase in density of the material
42.

Capacitance increases with ________

A. Increase in plate area
B. Decrease in plate area
C. Increase in distance between the plates
D. Increase in distance between the plates
Answer» B. Decrease in plate area
43.

Capacitor preferred when there is high frequency in the circuits is __________

A. Electrolyte capacitor
B. Mica capacitor
C. Air capacitor
D. Glass capacitor
Answer» C. Air capacitor
44.

A capacitor consists of_________

A. Two conductors
B. Two semiconductors
C. Two dielectrics
D. Two insulators
Answer» B. Two semiconductors
45.

 For very low frequencies, capacitor acts as ________

A. Open circuit
B. Short circuit
C. Amplifier
D. Rectifier
Answer» B. Short circuit
46.

For high frequencies, capacitor acts as _________

A. Open circuit
B. Short circuit
C. Amplifier
D. Rectifier
Answer» C. Amplifier
47.

A 4microF capacitor is charged to 120V, the charge in the capacitor would be?

A. 480C
B. 480microC
C. 30C
D. 30microC
Answer» C. 30C
48.

Calculate the current in the capacitor having 2V supply voltage and 3F capacitance in 2seconds.

A. 2A
B. 5A
C. 6A
D. 3A
Answer» E.
49.

 If 2V is supplied to a 3F capacitor, calculate the chance stored in the capacitor.

A. 1.5C
B. 6C
C. 2C
D. 3C
Answer» C. 2C
50.

What is the relation between current and voltage in a capacitor?

A. I=1/C*integral(Vdt)
B. I=CdV/dt
C. I=1/CdV/dt
D. I=Ct
Answer» C. I=1/CdV/dt