Physics Questions: Paper - 7 |
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Sr. No. | Physics Model Question Paper 7: (For Class 11 and 12 and Pre-Medical/Engineering Entrance) |
Answers |
1. |
The dimensions of 'resistance' are same as those of _____ where h is the Planck's constant, e is the charge. (A) _{} (B) _{} (C) _{} (D) _{} |
Answer: (A) |
2. |
The efficiency of Carnot's heat engine is 0.5 when the temperature of the source is T_{1} and that of sink is T_{2}. The efficiency of another Carnot's heat engine is also 0.5. The temperature of source and sink of the second engine are respectively _____. (A) T_{1} + 5, T_{2} - 5 (B) T_{1} + 10, T_{2} - 10 (C) 2T_{1}, 2T_{2} (D) 2T_{1}, _{} |
Answer: (C) |
3. |
The equation of a simple harmonic wave is given by y = 6Sin 2p(2t - 0.1x), where x and y are in mm and t is in seconds. The phase difference between two particles 2 mm apart at any instant is (A) 18^{0} (B) 36^{0} (C) 54^{0} (D) 72^{0} |
Answer: (D) |
4. |
The focal length of a plano convex lens is 'f' and its refractive index is 1.5. It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid. As a result, the effective focal length of the combination becomes 2f. Then the refractive index of the liquid is ______. (A) 1.25 (B) 1.33 (C) 1.5 (D) 2 |
Answer: (A) |
5. |
The forbidden energy gap in Ge is 0.72 eV. Given, hc = 12400 eV - _{}. The maximum wavelength of radiation that will generate an electron hole pair is ______. (A) 17222_{} (B) 1722_{} (C) 172220_{} (D) 172.2_{} |
Answer: (A) |
6. |
The magnetic field at the centre of a circular current carrying conductor of radius r is B_{c}. The magnetic field on its axis at a distance r from the centre is B_{a}. The value of B_{c} : B_{a} will be (A) 1 : _{} (B) 1 : 2_{} (C) 2_{} : 1 (D) _{} : 1 |
Answer: (C) |
7. |
The masses of two radioactive substances are same and their half lives are 1 year and 2 years respectively. The ratio of their activities after 6 years will be (A) 1 : 4 (B) 1 : 2 (C) 1 : 3 (D) 1 : 6 |
Answer: (A) |
8. |
The maximum kinetic energy of emitted electrons in a photoelectric effect does not depend upon (A) wavelength (B) frequency (C) intensity (D) work function |
Answer: (C) |
9. |
The maximum number of possible interference maxima when slit separation is equal to 4 times the wavelength of light used in a double slit experiment is (A) ¥ (B) 9 (C) 8 (D) 4 |
Answer: (B) |
10. |
The most stable particle in Baryon group is (A) neutron (B) omega - particle (C) proton (D) lamda - particle |
Answer: (C) |