A fireman wants to slide down a rope. The ropee can bear a tension of 74% of the weight of the man. With what minmuum acclearation shoud the... View Article
12 identical rods made of the same material are arranged in the form of a cube. The temperature of 'p' and 'r' are maintained at 90 °C and 30 °C... View Article
A step-down transformer reduces the voltage of the transmission line from 2200 V to 220 V. The power delivered by it is 8800 W and its efficiency... View Article
A solid conducting sphere having a charge q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential... View Article
An aircraft moves 400m towards the north, 300m towards the west, and then 1200m vertically upward. Then its displacement from the initial... View Article
We push or pull an object on a surface against the friction between the surface and the object. The frictional force increases as the normal... View Article
In a Wheatstone's bridge, all four arms have equal resistance r. If the resistance of the galvanometer arm is also r, the equivalent resistance... View Article
The EMF of a cell is greater than its terminal voltage because there is some potential drop across the cell due to its small internal resistance.... View Article
The temperature coefficient for a reaction is two. How many times does the rate of reaction increase if the temperature of the reaction is... View Article
Water is falling on the blades of a turbine from a height of 40m. If the speed of the river before the fall is 10 m/s and the area of the blade... View Article
Microwave oven acts on the principle of a) giving rotational energy to water molecules b) giving translational energy to water molecules c)... View Article
Which of the following is incorrect? (a) The dimension of a derived quantity is never zero in any base quantity (b) The dimension of a base... View Article
Which of the following is not true? (a) At large distances, the electric dipole potential varies as 1/r. (b) Electrostatic potential varies as... View Article
A student is performing an experiment using a resonance column and a tuning fork of frequency 244 s-1. The student is told that the air in the... View Article
The system shown below is in equilibrium. What is the acceleration of block m1, immediately after spring k2 is cut? (a) 0 (b) (c) g (d)... View Article
The rectangular loop shown in the figure is co-planar with the straight infinitely long wire carrying current 5 A. The magnetic flux through the... View Article
If work done in increasing the size of rectangular soap film with dimensions 8 cm × 3.75 cm to 10 cm × 6 cm is 2 × 10–4 J. The surface tension of... View Article
Four cubes of side “a” each of mass 40gm, 20gm,10gm and 20gm are arranged in xy plane as shown in figure. The coordinates of centre of mass... View Article
