Smoke from a fire looks white. What can you deduce about the size of the particles of ash in it ?

What can you say about the resistance of an ammeter?

What can you say about the resistance of a voltmeter?

A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say about the initial velocity of the particle?

What can be said about the curvature of the eye lens if it becomes thin?

A particle is travelling in a circular path of radius 4m . At a certain instant the particle is moving at 20m/s and its acceleration is at an angle of 37^(@) from the direction to the centre of the circle as seen from the particle (i) At what rate is the speed of the particle increasing? (ii) What is the magnitude of the acceleration?

A rope placed straight on a frictionless floor is pulled longtudinally by a force F. Tension force 7^(@) developed in the rope at a point varies with distance x of the point from the rear end as shown in the graph. What can you certainly conclude about density of the rope?

A point is in the XZ-plane. What can you say about its y coordinate ?