Physics Questions: Paper  12 
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Sr. No.  Physics Model Question Paper 12: (For Class 11 and 12 and PreMedical/Engineering Entrance) 
Answers 
1. 
The dimensions of_{}are (A) _{} (B) _{} (C) [L^{}^{1}T] (D) [LT1] 
Answer: (D) 
2. 
The electric and the magnetic field, associated with an e.m. wave, propagating along the +zaxis, can be represented by (A) _{} (B) _{} (C) _{} (D) _{} 
Answer: (B) 
3. 
The maximum height attained by a projectile when thrown at an angle q with the horizontal is found to be half the horizontal range. Then q = (A) Tan^{}^{1}_{} (B) _{} (C) _{} (D) Tan^{}^{1}2 
Answer: (D) 
4. 
The moment of inertia of a thin uniform rod of mass M and length L about an axis passing through its midpoint and perpendicular to its length is I_{0}. Its moment of inertia about an axis passing through one of its ends and perpendicular to its length is (A) I_{0 }+ ML^{2 } (B) _{} (C) _{} (D) I_{0 }+ 2ML^{2 }

Answer: (C) 
5. 
The ratio of the velocity of sound m hydrogen _{} to that in helium _{} at the same temperature is (A) _{} (B) _{} (C) _{} (D) _{} 
Answer: (B) 
6. 
Two equal forces (P each) act at a point inclined to each other at an angle of 120°. The magnitude of their resultant is _______. (A) P (B) 2 P (C) _{} (D) _{} 
Answer: (A) 
7. 
Two waves are represented by the equations y_{1 }= asin(wt + kx + 0.57)m and y2 = acos(wt + kx)m, where x is in meter and t in s. The phase difference between them is (A) 0.57 radian (B) 1.0 radian (C) 1.25 radian (D) 1.57 radian 
Answer: (B) 
8. 
With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound should appear double the actual frequency? (v is velocity of sound). (A) _{} (B) 3 _{} (C) 2 _{} (D) _{} 
Answer: (D) 
9. 
When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is (A) 3 ´ 10^{8 }ms^{}^{1} (B) 2 ´ 10^{8 }ms^{}^{1} (C) _{} ´ 10^{8 }ms^{}^{1} (D) _{}´ 10^{8 }ms^{}^{1} 
Answer: (C) 
10. 
A missile is fired for maximum range with an initial velocity of 20 m/s. If g = 10 m /s^{2}, the range of the missile is (A) 20 m (B) 40 m (C) 50 m (D) 60 m 
Answer: (B) 