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PHYSICS (Theory)
Time allowed : 3 hours
Maximum Marks : 70
General Instructions:
(i)
All questions are compulsory.
(ii) There are 30 questions in total. Questions 1 to 8 are very short answer type questions and carry one marks each.
(iii) Questions 9 to 18 carry two marks each, questions 19 to 27 carry three marks each and questions 28 to 30 carry five marks each.
(iv) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks each. You have to attempt only one of the given choices in such questions.
(v) Use of calculators is not permitted. However, you may use log tables if necessary.
(vi) You may use the following physical constants wherever necessary: c = 3 × 108 m/s h = 6.63 × 10–34 Js e = 1.6 × 10–19 C µ0 = 4π × 10–7 T mA–1
Nm 2
1
= 9 × 109
C2
4πε 0 me = 9.1 × 10–31 kg
122
QUESTION PAPER CODE 51/1/1
1.
A point charge Q is placed at point O as shown in the figure. Is the potential difference VA – VB positive, negative or zero, if Q is (i) positive (ii) negative ?
1
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the direction of electric and magnetic field vectors?
1
A resistance R is connected across a cell of emf ε and internal resistance r. A potentiometer now measures the potential difference between the terminals of the cell as V. Write the expression for 'r' in terms of ε, V and R.
1
The permeability of a magnetic material is 0.9983. Name the type of magnetic materials it represents.
1
Show graphically, the variation of the de-Broglie wavelength (λ) with the potential
(V) through which an electron is accelerated from rest.
1
In a transistor, doping level in base is increased slightly. How will it affect (i) collector current and (ii) base current ?
1
7.
Define the term 'wattless current'.
1
8.
When
Time allowed : 3 hours
Maximum Marks : 70
General Instructions:
(i)
All questions are compulsory.
(ii) There are 30 questions in total. Questions 1 to 8 are very short answer type questions and carry one marks each.
(iii) Questions 9 to 18 carry two marks each, questions 19 to 27 carry three marks each and questions 28 to 30 carry five marks each.
(iv) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks each. You have to attempt only one of the given choices in such questions.
(v) Use of calculators is not permitted. However, you may use log tables if necessary.
(vi) You may use the following physical constants wherever necessary: c = 3 × 108 m/s h = 6.63 × 10–34 Js e = 1.6 × 10–19 C µ0 = 4π × 10–7 T mA–1
Nm 2
1
= 9 × 109
C2
4πε 0 me = 9.1 × 10–31 kg
122
QUESTION PAPER CODE 51/1/1
1.
A point charge Q is placed at point O as shown in the figure. Is the potential difference VA – VB positive, negative or zero, if Q is (i) positive (ii) negative ?
1
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the direction of electric and magnetic field vectors?
1
A resistance R is connected across a cell of emf ε and internal resistance r. A potentiometer now measures the potential difference between the terminals of the cell as V. Write the expression for 'r' in terms of ε, V and R.
1
The permeability of a magnetic material is 0.9983. Name the type of magnetic materials it represents.
1
Show graphically, the variation of the de-Broglie wavelength (λ) with the potential
(V) through which an electron is accelerated from rest.
1
In a transistor, doping level in base is increased slightly. How will it affect (i) collector current and (ii) base current ?
1
7.
Define the term 'wattless current'.
1
8.
When