MODEL PAPER 10 — Science STD 10 — Question

A metal combines with a non-metal by the transfer of electrons to form a compound Y.

1. State the type of bonds in Y.
2. What can you say about its melting point and boiling point?
3. Will it be a good conductor of electricity?
4. Will it dissolve in an organic solvent or not?

1. State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also draw a graph to show this relationship.
2. Find the resistance of a conductor if the electric current flowing through it is 0.35A when the potential difference across it is 1.4V.

How do villi increase the surface area?

A 2.0cm tall object is placed 40 cm from a diverging lens of focal length 15cm. Find the position and size of the image.

1. A ray of white light breaks up into its components while passing through a glass prism. Draw a ray diagram to show the path of rays?
2. Mark the least deviated colour in your diagram?
3. Why do different coloured rays deviate differently in a prism?

A concave lens has focal length 15cm. At what distance should the object from the lens be placed so that it forms an image at 10cm from the lens? Also find the magnification produced by the lens.

An object 20cm from a spherical mirror gives rise to a virtual image 15cm behind the mirror. Determine the magnification of the image and the type of mirror used.

Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2Ω in series with a combination of two resistors (4Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2Ω resistor be the same as that across the parallel combination of 4Ω resistors? Give reason.

List any two modes of asexual reproduction in animals. Under which mode of reproduction is vegetative propagation placed and why? List two advantages of vegetative propagation.

An electric heater is connected to the 230V mains supply. A current of 8A flows through the heater.

1. How much charge flows around the circuit each second?
2. How much energy is transferred to the heater each second?