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Physics Question Answers Teaching Jobs MCQs Solved List

Q.1: Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is--------- ?

1. 0.5
2. 0.2
3. 1
4. 2

D

Q.2: In hydrogen spectrum which one of the following series lies in the ultraviolet region ?

1. Balmer series
2. Pfund series
3. Bracket series
4. Lymann series

D

Q.3: Bracket series is obtained when all transition of electron terminate on--------- ?

1. 4th orbit
2. 5th orbit
3. 3rd orbit
4. 2nd orbit

A

Q.4: Radiation produced from TV picture tube is-------- ?

1. B-rays
2. X-rays
3. Far infrared
4. Infrared

B

Q.5: Which one of the following has the greatest energy gap ?

1. insulator
2. conductor
3. semi conductor
4. any of above

A

Q.6: The simplest type of rectification known as half wave rectification is obtained by--------- ?

1. using a transistor
2. suppressing the harmonics in A.C voltage
3. suppressing half wave of A.C supply by using diode
4. using a Coolidge tube

C

Q.7: An OP-AMPs can amplify------- ?

1. D.C.
2. A.C.
3. Both A.
4. & D.C.
5. None of the above

B

Q.8: If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of------- ?

1. Boyles law
2. Charles law
3. Ideal gas law
4. Avagadros law

B

Q.9: At what temperature is the Fahrenheit scale reading equal to twice that of the Celsius scale ?

1. 460°C
2. 280°C
3. 360°C
4. 160°C

D

Q.10: An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a -------- ?

1. Non-inverting voltage at output
2. Virtual input
3. Output
4. Reference voltage on the other

D

Q.11: The purpose of flywheel in the engines is------- ?

1. to smooth out the energy variation
2. to add more weight to engine to work it stable
3. to start engine
4. both A and B

A

Q.12: A vector can be multiplied by a number. The number may be----- ?

1. Dimensionless
2. Dimensional scalar
3. Negative
4. All A, B and C are correct

D

Q.13: A central force is that which-------- ?

1. Can produce torque
2. Cannot produce torque
3. Some time can produce torque some time cannot
4. Has no relation with torque

B

Q.14: An angle between two vectors A and B can be determined by-------- ?

1. Their dot product
2. Their cross product
3. Head to tail rule
4. Right-hand rule

A

Q.15: Antimatter consists of -------- ?

1. Antiproton
2. Antineutron
3. Positron
4. All of above

D

Q.16: Which one of the following radiations possesses maximum velocity ?

1. α-rays
2. β-rays
3. γ-rays
4. All of above have the same speed

C

Q.17: Which one of following postulate is in accordance with the Rutherfords model ?

1. continuous spectra for atoms
2. discrete spectra for atoms
3. either continuous nor discrete
4. no spectrum

A

Q.18: UV radiation can be produced by-------- ?

1. Heating the filament
2. Electron excitation in the gas
3. Ionization of atoms
4. All the above

B

Q.19: Semi-conductor germanium and silicon are--------- ?

1. pentavalent
2. trivalent
3. divalent
4. tetravalent

D

Q.20: Depletion region of a junction is formed------ ?

1. during the manufacturing process
2. under forward bias
3. under reverse bias
4. when temperature varies

A