Secondary School (English Medium) (5 to 8) इयत्ता ७ - CBSE Question Bank Solutions

Complete the data of the table given below with the help of the distance-time graph given in the figure.

Starting from A, Paheli moves along a rectangular path ABCD as shown in figure. She takes 2 minutes to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform.

Distance between Bholu’s and Golu’s house is 9 km. Bholu has to attend Golu’s birthday party at 7 o’clock. He started from his home at 6 o’clock on his bicycle and covered a distance of 6 km in 40 minutes. At that point, he met Chintu and he spoke to him for 5 minutes and reached Golu’s birthday party at 7 o’clock. With what speed did he cover the second part of the journey? Calculate his average speed for the entire journey.

Boojho goes to the football ground to play football. The distance-time graph of his journey from his home to the ground is given in the figure.

1. What does the graph between points B and C indicate about the motion of Boojho?
2. Is the motion between 0 to 4 minutes uniform or non-uniform?
3. What is his speed between 8 and 12 minutes of his journey?

You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

An erect and enlarged image can be formed by

You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from

An image formed by a lens is erect. Such an image could be formed by a

State whether the following statement is True or False.

The sides of an object and its image formed by a concave mirror are always interchanged

The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?

State whether the following statement is True or False. If false, give the correct statement.

The process of seeping of water into ground is called filtration

From where do the following usually get water? In which form is water present in them?

Mountain tops

Which of the following is not prepared from the wood obtained from forest?

The main excretory product in human beings is ______.

Sweat contains water and ______.

Kidneys eliminate the waste materials in the liquid form called ______.

Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below:

Water, minerals, (a) _____________, (b) ______________.

A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?

Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials.

1. Available in the plant: _______________
2. Available in the soil: _______________, _______________
3. Available in the air: _______________
4. Available during day: _______________

Wild animals like tiger, wolf, lion and leopard do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation?