Question
Two poles are positioned at a certain distance from each
other. A train traveling at a speed of 90 km/hr passes the first pole in 5 seconds and reaches the second pole in 13 seconds. What is the distance between the two poles?Solution
Speed of train = 90 × 5/18 = 25 m/s Length of the train = 25 × 5 = 125 metres Let the distance between the poles be x metres (125 + x)/13 = 25 Or, 125 + x = 325 Or, x = 200 metres Hence, option d.
What is the name of the process by which a liquid changes into gas at all temperatures? Â
The rate of transfer of charges through a circuit is called?
 The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. If focal length of the lens is 36 cm find the refractive index of t...
Which instrument is primarily used to measure the relative density of liquids by utilizing the principle of buoyancy?
Which device is best suited for measuring the temperature inside metallurgical furnaces?
The movement of a train is an example of what type of motion?
Which of the following is NOT a conductor of electricity?
What happens to the wavelength of light when it passes from a medium of higher refractive index to a medium of lower refractive index? Â
A projectile is fired at an angle θ and reaches maximum height
H and range R. The angle between velocity and acceleration at the highest poin...
A block of mass 2kg is pushed against a light spring of spring constant 200N/m and compressed by 0.2m on a horizontal surface with kinetic friction coe...