Importance of Value Based Education
Home | About Us | pmtPHYSICS1. Two vectors of equal magnitude A on addition give a resultant vector of magnitude A. Then the magnitude of their difference vector is (a) (b) 2A(c) zero (d) 2. From the top of a tower 40 m high, a ball is projected upwards with a speed of 20 m s1 at an angle 30 with the horizontal. The total time of flight to hit the ground is (g = 10 m s2)(a) 8 s (b) 4 s (c) 6 s (d) 3 s3. To a boy in air, a fish in water viewed normally from air appears to be at 0.6 m from the surface of water. If the refractive index of water is , then the actual depth from the surface to fish is (a) 0.8 m (b) 0.5 m(c) 0.95 m (d) 0.3 m4. Two resistors R1 (10 ) and R2 (20 ) are connected in parallel. If the percentage error in the measurement of R1 and R2 are 2% and 1% respectively, then percentage error in measurement of resistance of parallel combination will be (a) 3% (b) 1.67%(c) 2.7% (d) 4.33%5. A uniform chain of length L and mass M is lying on a horizontal table with of its length hanging over the edge of the table. Minimum work done to pull back this hanging portion on to the table is (a) (b) (c) (d) 6. A having linear mass densitythin uniform wire of length , is bent in the form of a circle as shown in the figure. Then moment of inertia of this loop about an axis passing through the point P, and perpendicular to the loop will be (a) (b) (c) (d) 7. From the surface of Earth, an object is projected with certain speed, so that it reaches a height equal to above the surface of Earth. Then initial velocity of projection will be (g = acceleration due to gravity on the surface of Earth)(a) (b) (c) (d) 8. A is moving away from an infinitelyuniform rod of length long straight current carrying conductor with a uniform speed v as shown in the figure. The emf induced between the ends of the moving rod, when it is at the position as shown in the figure will be (a) (b) (c) (d) zero9. Which one of the following statements regarding magnetic materials is true?(a) For