When a slide is placed 15 cm behind the lens in the projector, an image is formed 3 m in front of the lens. If the focal length of the lens is 14 cm, draw a ray diagram to show image formation. (not to scale)
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The above images are that of a specialized slide projector. Slides are small transparencies mounted in sturdy frames ideally suited to magnification and projection, since they have a very high resolution and a high image quality. There is a tray where the slides are to be put into a particular orientation so that the viewers […]
50% of the offspring of Pooja’s brother are green eyed. With help of cross show how this is possible.
Pooja has green eyes while her parents and brother have black eyes. Pooja’s husband Ravi has black eyes while his mother has green eyes and father has black eyes. (a) On the basis of the above given information, is the green eye colour a dominant or recessive trait? Justify your answer. (b) What is the […]
In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason. A – Iron Bucket electroplated with Zinc B – Electricity cables having iron wires covered with aluminium C – Iron hinges on a gate D – Painted iron fence
Two students decided to investigate the effect of water and air on iron object under identical experimental conditions. They measured the mass of each object before placing it partially immersed in 10 ml of water. After a few days, the object were removed, dried and their masses were measured. The table shows their results. Student […]
The diagram above is a schematic diagram of a household circuit. The house shown in the above diagram has 5 usable spaces where electrical connections are made. For this house, the mains have a voltage of 220 V and the net current coming from the mains is 22A. (a) What is the mode of connection […]
Explain how the uterus and placenta provide necessary conditions for proper growth and development of the embryo after implantation?
How are variations useful for species if there is drastic alteration in the niches?
Why is it not possible to reconstruct the whole organism from a fragment in complex multicellular organisms?