how do organisms reproduce ? — Science STD 10 — Question

What is the significance of lymph?

What is an aqua regia?

How is a voltmeter connected in the circuit to measure the potential difference between two points?

Which property of a concave mirror is utilized for using it as a shaving mirror?

Amit is a domestic help (or maid) working at Mr Dave's house. One day Amit complained to Mr Dave that he had difficulty in reading the letter which he had received from his parents. Mr Dave, realising that Amit had an eye defect, took him to an eye specialist doctor. The doctor tested his eyes carefully and told Amit to wear spectacles containing certain type of lenses having specified power. Mr Dave bought the required spectacles for Amit. By wearing this spectacle, Amit could read and write easily. He was very happy and thanked Mr Dave.
(1) What could be the eye defect Amit was suffering from?
(2) What could be the two possible reasons responsible for his eye defect? What type of lenses do you think the doctor recommended for Amit's spectacles ?
(3) What values are displayed by Mr Dave in this episode?

In which unit is amount of atmospheric ozone expressed?

In a given ammeter, a student observes that the needle indicates 17 divisions in the ammeter when performing an experiment to verify Ohm's law. If the ammeter has 10 divisions between 0 and 0.5 A , then what is the value of 17 divisions?

What is the minimum distance between an object and its real image in case of a concave mirror?

Write the name of chemical used in black and white photography.