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660+ A Level Physics Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .

Chapters

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Chapter: Electromagnetism and Magnetic Field
201.

A flat coil and solenoid has

A. different fields
B. same physical properties
C. same fields
D. same chemical properties
Answer» C. same fields
discuss
202.

Flux density is defined by {{}}

A. FIL
B. F⁄(IL
C. IL
D. I⁄(FL
Answer» B. F⁄(IL
discuss
203.

Strength of magnetic field of solenoid can be increased by adding core made of

A. copper
B. ferrous
C. silver
D. aluminum
Answer» B. ferrous
discuss
204.

In Fleming's left hand rule, thumb shows direction of

A. current
B. field
C. motion
D. charge
Answer» C. motion
discuss
205.

If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is

A. thrice the Earth's magnetic flux density
B. four times the Earth's magnetic flux density
C. five times the Earth's magnetic flux density
D. twice the Earth's magnetic flux density
Answer» D. twice the Earth's magnetic flux density
discuss
Chapter: Electronics
206.

LED starts to conduct when voltage is about

A. 1 V
B. 4 V
C. 3 V
D. 2 V
Answer» D. 2 V
discuss
207.

For non-inverting amplifier the input and output is

A. out of phase
B. in phase
C. have phase difference of 180°
D. have phase difference of 90°
Answer» B. in phase
discuss
208.

A sensing device is also called

A. transistor
B. thermistor
C. sensor
D. transducer
Answer» D. transducer
discuss
209.

Op-amp can provide maximum output current of

A. 25 mA
B. 30 mA
C. 35 mA
D. 40 mA
Answer» A. 25 mA
discuss
210.

Output resistance of an actual op-amp is

A. 45Ω
B. 46Ω
C. 70Ω
D. 75Ω
Answer» D. 75Ω
discuss
211.

Impedance of ideal op-amp is

A. zero
B. 1
C. infinite
D. 2
Answer» C. infinite
discuss
212.

Change in length and cross-sectional area of metal wire changes

A. current
B. voltage
C. resistance
D. magnetic effect
Answer» C. resistance
discuss
213.

Amplifier produces output with more

A. power only
B. voltage only
C. current only
D. power and voltage
Answer» D. power and voltage
discuss
214.

Number of power supplies required to get output of op-amp is

A. two
B. four
C. six
D. three
Answer» A. two
discuss
215.

A device used to avoid the relay destroying the op-amp is

A. diode
B. LED
C. reverse bias diode
D. forward biased diode
Answer» C. reverse bias diode
discuss
216.

As long as op-amp is not saturated, the potential difference between inverting and non-inverting inputs is

A. zero
B. infinite
C. 1
D. 2
Answer» A. zero
discuss
217.

A light dependent resistor is made up of

A. low resistance semiconductor
B. low resistance metal
C. high resistance semiconductor
D. high resistance metal
Answer» C. high resistance semiconductor
discuss
218.

In inverting amplifier, the phase difference between input and output voltages must be

A. 30°
B. 45°
C. 90°
D. 180°
Answer» D. 180°
discuss
219.

An infinite slew rate refers to

A. no time delay
B. small time delay
C. large time delay
D. variable time delay
Answer» A. no time delay
discuss
220.

To limit current in LED, resistor should be connected in

A. parallel
B. series
C. evacuated flask
D. ionized tube
Answer» B. series
discuss
221.

A component whose property changes when there is a change in any physical quantity of a device is

A. processor
B. sensor
C. output device
D. portable device
Answer» B. sensor
discuss
222.

Benefits of negative feedback include

A. less distortion
B. increased bandwidth
C. low output resistance
D. all of above
Answer» D. all of above
discuss
223.

When temperature rises, resistance of negative temperature coefficient thermistor

A. increases
B. decreases
C. zero
D. infinity
Answer» B. decreases
discuss
224.

If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is

A. 500Ω
B. 400Ω
C. 300Ω
D. 200Ω
Answer» A. 500Ω
discuss
225.

Graph of resistance of thermistor to temperature is

A. exponential decrease
B. linear decrease
C. exponential increase
D. linear increase
Answer» A. exponential decrease
discuss
226.

Output current from an LED is

A. 20 mA
B. 30 mA
C. 40 mA
D. 50 mA
Answer» A. 20 mA
discuss
227.

In an inverting amplifier the non-inverting input (+) is connected to

A. 1 V line
B. 0 V line
C. 2 V line
D. 3 V line
Answer» B. 0 V line
discuss
228.

Actual op-amp may have an open loop gain of{{}}

A. 102
B. 105
C. 103
D. 104
Answer» B. 105
discuss
229.

Coil of relay is connected to the

A. input of op-amp
B. output of op-amp
C. midpoint of op-amp
D. anywhere in between input and ouput of op-amp
Answer» B. output of op-amp
discuss
Chapter: Forces, Vectors and Moments
230.

Pair of forces that cause steering wheel of a car to rotate is called

A. couple
B. friction
C. normal force
D. weight
Answer» A. couple
discuss
231.

If the principle of moments for any object holds, then object is in state of

A. inertia
B. equilibrium
C. suspension
D. motion
Answer» B. equilibrium
discuss
232.

Combined effect of several forces is known as

A. net force
B. resultant force
C. normal force
D. weight
Answer» B. resultant force
discuss
233.

To form a couple, the force should be

A. equal in magnitude
B. parallel and opposite
C. separated by distance
D. all of above
Answer» D. all of above
discuss
234.

Moment of force depends upon

A. magnitude of force
B. perpendicular distance of force from pivot
C. both A and B
D. axis of rotation
Answer» C. both A and B
discuss
235.

Two perpendicular components are

A. independent of each other
B. dependent on each other
C. anti parallel to each other
D. parallel to each other
Answer» A. independent of each other
discuss
236.

Object is in equilibrium if resultant force acting on it is

A. increasing
B. decreasing
C. zero
D. becomes constant
Answer» C. zero
discuss
237.

Center of gravity of an irregular body lies on the

A. edge
B. center of body
C. point of intersection of lines
D. along the axis of rotation
Answer» C. point of intersection of lines
discuss
238.

Number of forces a falling tennis ball experiences is

A. 1
B. 3
C. 2
D. 4
Answer» C. 2
discuss
239.

Point where all weight of object acts is called

A. central point
B. center of gravity
C. edge
D. center of mass
Answer» B. center of gravity
discuss
240.

If weight of a falling tennis ball is 1.0 N and drag force acting on it is 0.2 N then resultant force is

A. 0.8 N
B. 0.5 N
C. 1 N
D. 2 N
Answer» A. 0.8 N
discuss
241.

If the resultant vector forms an angle of 45°, then the two components are

A. parallel to each other
B. perpendicular to each other
C. anti parallel to each other
D. anti perpendicular to each other
Answer» B. perpendicular to each other
discuss
Chapter: Gravitational Field
242.

Force acting on two point masses is directly proportional to

A. sum of masses
B. difference of masses
C. distance between masses
D. product of masses
Answer» D. product of masses
discuss
243.

Mass of Earth when it's radius is 6400 km and gravitational field strength is 9.81 N kg -1 is {{}}

A. 6.0 × 1024 kg
B. 5 × 1023 kg
C. 40 × 109 kg
D. 9 × 10 24 kg
Answer» A. 6.0 × 1024 kg
discuss
244.

On scale of building, gravitational field is

A. increasing
B. decreasing
C. uniform
D. varying
Answer» C. uniform
discuss
245.

Decrease in field strength on top of Mount Everest is

A. 10%
B. 5%
C. 1%
D. 0.3%
Answer» D. 0.3%
discuss
246.

Work done on an object to bring it to certain point in space is called

A. gravitational potential energy
B. potential energy
C. kinetic energy
D. mechanical energy
Answer» A. gravitational potential energy
discuss
247.

N kg-1is equivalent to{{}}

A. m s-2
B. m s-1
C. m s
D. m s-3
Answer» A. m s-2
discuss
248.

Mass of satellite orbiting Earth is

A. considered
B. irrelevant
C. should be infinite
D. should be zero
Answer» B. irrelevant
discuss
249.

Spacing between field lines indicates

A. direction of field lines
B. strength of field lines
C. magnitude of field lines
D. work done by field lines
Answer» B. strength of field lines
discuss
250.

Square of orbital period is proportional to

A. radius
B. square of radius
C. cube of radius
D. square of diameter
Answer» C. cube of radius
discuss

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