Please select a subject first
Advertisements
Advertisements
Write one structural difference between the composition of arteries and veins.
Concept: Blood Vessels
Name the basic filtration unit present in the kidney.
Concept: Excretion
Name the basic filtration unit present in the kidney.
Concept: Excretion
List the steps of preparation of temporary mount of a leaf peel to observe stomata.
Concept: Mode of Nutrition in Plant > Autotrophic Plants
Name one gustatory receptor and one olfactory receptor present in human beings.
Concept: Reflex and Reflex Action
Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.
Concept: Human Nervous System
Name the hormones secreted by the given endocrine glands and specify one function.
Thyroid
Concept: Hormones in Animals
Name the hormones secreted by the given endocrine glands and specify one function.
Pituitary
Concept: Hormones in Animals
Name the hormones secreted by the given endocrine glands and specify one function.
Pancreas
Concept: Hormones in Animals
If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.
Concept: Spherical Mirrors > Convex Mirror
A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens
Concept: Power of a Lens
An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre 'O' of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O' and principal focus 'F' on the diagram. Also find the approximate ratio of size of the image to the size of the object.
Concept: Convex Lens
Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.
Concept: Applications of Scattering of Light
A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.
Concept: Eye Defect and Its Correction: Myopia Or Near-sightedness
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Concept: Electrical Power
Show how would you join three resistors, each of resistance 9 Ω so that the equivalent resistance of the combination is
1) 13.5
2) 6 Ω
Concept: System of Resistors > Resistors in Parallel
List the factors on which the resistance of a conductor in the shape of a wire depends.
Concept: Factors Affecting the Resistance of a Conductor
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason?
Concept: Electric Current
