Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.
Bryophyte pteridophyte Gymnosperm
The moon also attract earth but we do not feel. The mass of Earth is too much greater than the moon so we can only see that only Moon revolves around the Earth.
Q2. What shape is (a) Your instrument box? (b) A brick? (c) A matchbox? (d) A road-roller? (e) A sweet laddu?
A binary number uses only two digits zero and one. In a binary system, numbers are represented as follows
|NUMBER AS INTEGER||NUMBER IN BINARY|
National Institute of Open Schooling (NIOS). View details on NIOS official website
Ever observed an old glass window? It will be thicker at the base than the top. This shows that glass flows(at a very slow rate) and it can flow because it is amorphous.
During sunrise and sunset, the light has to travel a long distance in the atmosphere. So light of small wavelength scatters and the least scattered light reaches our eyes. Red is the least scattered light. So sky looks red.
The following are the reasons for using steel instead of other materials to make robots.
1. Steel is commonly available and it is found in the form of an alloy of Iron.
2. It is stronger than other metals like aluminum.
3. Welding is easy to do
4. It blunts tools easily.
Hence the above reasons make steel favorable building material for Robots.
Q: 8.21 Two heavy spheres each of mass and radius are placed apart on a horizontal table. What is the gravitational force and potential at the mid point of the line joining the centres of the spheres? Is an object placed at that point in equilibrium? If so, is the equilibrium stable or unstable?
Q3 Given in Fig. 6.11 are examples of some potential energy functions in one dimension. The total energy of the particle is indicated by a cross on the ordinate axis. In each case, specify the regions, if any, in which the particle cannot be found for the given energy. Also, indicate the minimum total energy the particle must have in each case. Think of simple physical contexts for which these potential energy shapes are relevant.
Q 3.17 Figure shows the x-t plot of one-dimensional motion of a particle. Is it correct to say from the graph that the particle moves in a straight line for t < 0 and on a parabolic path for t > 0? If not, suggest a suitable physical context for this graph.
3.20 b) Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (iii) 6 Ω
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Question 6. Let ∗ be the binary operation on N given by a ∗ b = L.C.M. of a and b. Find
(v) Which elements of N are invertible for the operation ∗?