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Science - Questions

CBSE 7th standard Questions

  Describe the different methods of asexual reproduction. Give examples.
(class: 7th std )    Science

  Explain what you understand by sexual reproduction.
(class: 7th std )    Science

  State the main difference between asexual and sexual reproduction.
(class: 7th std )    Science

  Explain the difference between self-pollination and cross-pollination.
(class: 7th std )    Science

  How does the process of fertilisation take place in flowers?
(class: 7th std )    Science

  Which type of mirror can form a real image?
(class: 7th std )    Science

  An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.
(class: 7th std )    Science

  Describe the various ways by which seeds are dispersed.
(class: 7th std )    Science

  Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.
(class: 7th std )    Science

  The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.
(class: 7th std )    Science

  The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
(class: 7th std )    Science

  A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?
(class: 7th std )    Science

  Classify the following as motion along a straight line, circular or oscillatory motion:
(class: 7th std )    Science

  When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
(class: 7th std )    Science

  Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
(class: 7th std )    Science

  Name any two effects of electric current.
(class: 7th std )    Science

  Which type of lens forms always a virtual image?
(class: 7th std )    Science

  State two differences between a convex and a concave lens.Give one use each of a concave and a convex mirror.
(class: 7th std )    Science

  What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.
(class: 7th std )    Science

  Why should oils and fats be not released in the drain? Explain.
(class: 7th std )    Science

  Explain the function of bar screens in a wastewater treatment plant.
(class: 7th std )    Science

  Explain how groundwater is recharged?
(class: 7th std )    Science

  What is a virtual image? Give one situation where a virtual image is formed.
(class: 7th std )    Science

  Explain the factors responsible for the depletion of water table.
(class: 7th std )    Science

  You have been asked to maintain a garden. How will you minimise the use of water?
(class: 7th std )    Science

  There are ten tubewells in a lane of fifty houses. What could be the long term impact on the water table?
(class: 7th std )    Science

  Explain why there is a need of variety of animals and plants in a forest.
(class: 7th std )    Science

  Why should we worry about the conditions and issues related to forests far from us?
(class: 7th std )    Science

  List five products we get from forests?
(class: 7th std )    Science

  Name two chemicals used to disinfect water.
(class: 7th std )    Science

    

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