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PHYSICS MCQs

Total Questions : 3767 | Page 45 of 377 pages
Question 441. A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become
  1.    C
  2.    C/7
  3.    7C
  4.    14C
 Discuss Question
Answer: Option C. -> 7C
Question 442. Speed regulation of synchronous motor is
  1.    1%
  2.    25%
  3.    Zero
  4.    0.5%
 Discuss Question
Answer: Option C. -> Zero
Question 443. Alternating current is converted into direct current by a
  1.    Transformer
  2.    Dynamo
  3.    Oscillator
  4.    Rectifier
 Discuss Question
Answer: Option D. -> Rectifier
Question 444. A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?
  1.    C1>C2
  2.    C2>C1
  3.    C1pa = C2pg
  4.    C1 = C2
 Discuss Question
Answer: Option D. -> C1 = C2
Question 445. Which compressor is usually used in AC?
  1.    Centrifugal
  2.    Rotary
  3.    Reciprocating
  4.    Axial
 Discuss Question
Answer: Option C. -> Reciprocating
Question 446. The best material for the core of a transformer is
  1.    Stainless steel
  2.    Mild steel
  3.    Hard steel
  4.    Soft iron
 Discuss Question
Answer: Option D. -> Soft iron
Question 447. A transformer works on the principle of
  1.    Self induction
  2.    Mutual induction
  3.    Generator
  4.    Inverter
 Discuss Question
Answer: Option B. -> Mutual induction
Question 448. Transformer is a device to convert
  1.    D.C. to A.C.
  2.    Low voltage D.C. into high voltage D.C.
  3.    Low voltage A.C. into high voltage A.C.
  4.    Mechanical energy into Electrical energy
 Discuss Question
Answer: Option C. -> Low voltage A.C. into high voltage A.C.
Question 449. Atomic hydrogen has a life period of
  1.    One hour
  2.    One day
  3.    One minute
  4.    A fraction of a second
 Discuss Question
Answer: Option D. -> A fraction of a second
Question 450. According to Rutherford's atomic model, the electrons inside an atom are
  1.    Centralized
  2.    Not Stationary
  3.    Stationary
  4.    None of these
 Discuss Question
Answer: Option B. -> Not Stationary

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