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Subject :NSO    Class : Class 6

Rohan wanted to test the strength of four magnets. He used each magnet to attract a paperclip from a distance. For each magnet, he increased the distance between the magnet and the paperclip until the magnet could no longer attract the paperclip. He then recorded his findings in a table.


Arrange the magnets from the strongest to the weakest.

A(i), (iii), (ii), (iv)
B(iii), (i), (ii), (iv)
C(ii), (iv), (i), (iii)
D(iv), (ii), (i), (iii)


b

Ans 1: (Master Answer)

Class : Class 1

B

Stronger the magnet, wider would be the spread of its magnetic field, so it would attract objects from larger distance.Hence, the correct order for the magnets from strongest  to weakest magnetic field is given in option B.


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Subject :NSO    Class : Class 6

Which of the following statements are incorrect?
(i) Every periodic motion is an oscillatory motion.
(ii) Motion of strings of a guitar shows oscillatory as well as vibratory motion.
(iii) In circular motion, the acceleration of the particle is zero.
(iv) Inertia is the property of a body by virtue of which it resists any change in its state of rest or of motion.
(v) Aluminium foils can never be used as connecting wires whatever the circuit is.

A (ii), (iii) and (v) only
B (i), (ii) and (iii) only
C (ii) and (iv) only
D (i), (iii) and (v) only


Ans 1: (Master Answer)

Class : Class 1

D

A periodic motion may or may not be oscillatory .For example , motion of earth about sun is periodic but not oscillatory.

During circular motion of an object , its direction of motion changes with time and hence the velocity.So,the acceleration of the object is non zero. 

Aluminium is a good conductor of electricity .Hence, statement v is wrong.

 


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Subject :NSO    Class : Class 5

Ritu took two bimetallic strips, I and II (of equal size, length and breadth) made up of metals P and Q; and Q and R, respectively as shown in the figure. She subjected each bimetallic strip to heating for the same time period. The given diagram shows her experiment.

Which of the following can be inferred from the given experiment?

AMetal Q expands more as compared to metals P and R on heating for the same time period.
BMetal R contracts more as compared to metals P and Q on heating for the same time period.
CThe order of expansion of these metals when subjected to heating is R < Q < P.
DBoth B and C


B says contracts more, so D is correct.

Ans 1:

Class : Class 5
* SOLUTION

Ans 2:

Class : Class 5
option C is correct. For explanation see explanation

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 7

Digestive juices were collected from three different regions of the alimentary canal. Drops of these juices were added to wells made in an agar of starch as shown in the given figure.

After an hour, the wells were rinsed with distilled water and flooded with iodine solution. The results are given in the table.

Well 1 2 3
Colour of iodine
solution
Blue-black Yellow - brown Yellow - brown
Which of the following correctly identifies the regions of the alimentary canal from which the three digestive juices were obtained?

AWell 1 represents region that contains an enzyme pepsin that causes the breakdown of proteins into simple substances.
BWell 2 could represent region that contains an enzyme called salivary amylase.
CWell 3 could represent region that is the longest portion of alimentary canal and receives bile juice from liver and pancreatic juice from pancreas.
DAll of these


The options are placed wrongly. Well 1 cannot turn blue-black as it has protein. Well 2 should turn blue-black because it has starches. Only option c is correct. The answer is C

Ans 1:

Class : Class 8
I guess the answer is option D.. You see that if well 2 has salivary amylase, then the starch will be converted into simple sugars => No starch is found from that well (it has converted to simpler form)

Ans 2:

Class : Class 7

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