Q1.
(a) Draw magnetic field lines of a bar magnet. “Two magnetic field lines never intersect each other”. Why ?
(b) An electric oven of 1.5 kW is operated in a domestic circuit (220 V) that has a current rating of 5 A. What result do you expect in this case ? Explain.
Q2.
a) In the formation of a compound XY 2 , atom X denotes one electron to each Y atom. Show the electron dot structure of X and Y and the formation of XY 2 what is the nature of bond in XY 2 ?
b) Write any three properties of XY
Q3. The electronic configurations of three elements X and Y are as follows :x – 2, 8, 2 and y – 2, 7 18 (a) Name one organ each where growth hormone is synthesized in man and plant.
(b) List the sequence of events that occur when a plant is exposed to unidirectional light, leading to bending of a growing shoot. Also name the hormone and the type of movement.
Q4.
(a) “The refractive index of rock salt is 1.54”. What is meant by this statement?
(b) Draw a ray diagram to show that the incident ray of light is parallel to emergent ray when light falls obliquely on a side of a rectangular glass slab
(c) The refractive index of diamond is 2.47 and that of glass is 1.51. How much faster does light travel in glass than in diamond ?
Q5.
(i) Calculate the distance at which an object should be placed in front of a convex lens of focal length 10 cm to obtain a virtual image of double its size.
(ii) Explain Power of Accommodation. Explain in brief the near and the far point of an eye and give their values
Q6.
Differentiate between the following :
(a) Pollen tube and Style
(b) Fragmentation and Regeneration
(c) Vegetative propagation and Spore formation
(d) Fission in Amoeba and Plasmodium
(e) Bud of Hydra and bud of Bryophyllum
Answers
Answer:
Explanation:
two magnetic field line nvr intersect each other because if the compass is placed at the point of intersection then the compass will show two direction at
any instant which is not possible .
b. the appliance will not work as the power req is 1500W whereas the source provides only 1100W
Q2. since x donates one electron to each y atoms therefore it must be in the form of X ² and that of y will be y with power / exponent 1
it is a form of ionic bond
consider formation of MgCl2
in this mg has a valency of 2 and cl a valency of 1
since both desire to be stable therefore they share accordingly
correct me if wrong
if not do mark as brainliest
THANKS
(a) The difference between style and pollen tube is:
Style is a part of the female reproductive system of the flower which connects the ovary to the stigma.
Pollen tube is a tube that is formed by the pollen grain when it lands on the stigma. A pollen tube passes through the style.
(b)The difference between fragmentation and regeneration is:
Fragmentation is the process by which an organism when broke into pieces or fragments and each fragment develops into a new organism.
Regenration is the process by which a lost part of the organism's body is reformed or regenerated.
(c) The difference between vegetative propagation and spore formation:
In vegetative propogation, a new plant develops from the vegetative part of the parent plant.
In spore formation, the parent body forms spores, which after being released develop into new organism.
(e) The difference between bud of Hydra and Bud of Brophyllum is:
The bud in Hydra is formed in a specific site in the body.
The bud in Brophyllum is formed in the leaf.