Objective Chap 10

If a group of n distinct objects, the number of arrangements of 4 object is 12 times the number of arrangements of 2 objects, then the number of objects is (a) 10 (b) 8 (c) 6 (d) none of these

The length of the tube of a microscope is 10 cm . The focal lengths of the objective and eye lenses are 0.5 cm and 1.0 cm . The magnifying power of the microscope is about

Angular magnification of telescope if focal length of objective and eye lenses are 10 cm and 10 mm respectively and tube length is 11cm:

If the wavelength of light used is 6000 Å. The angular resolution of telescope of objective lens having diameter 10 cm is ______ rad.

An object of mass 10 kg falls from rest through a vertical distance of 10 m and acquires a velocity of 10 ms^(-1) . The work done by the push of air on the object is (g = 10 ms^(-2) )

An object of mass 10kg moves at a constant speed of 10 ms^(-1) . A constant force, that acts for 4 sec on the object, gives it a speed of 2ms^(-1) in opposite direction. The force acting on the object is :

Object AB is placed on the axis of a concave mirror of focal length 10cm. End A of the object is at 30cm from the mirror. Find the length of the image a. if length of object is 5cm. b. if length of object is 1 mm.

What is the wavelength of an object with mass 10,000kgs that is moving with a velocity of 10,000 cm/sec?

An object moves 10 m in 4 s then turns left and moves 20 m in next 5 s. What is the average speed of the object?

An object weighs 10 N in air. When immessed fully in liquid, it weighs only 8 N. The weight of the liquid displaced by the object will be: