National Science Olympiad Forum By SOF Olympiad Trainer - Page 3

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Subject :NSO    Class : Class 6

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Class : Class 6

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 6

Read the given statements regarding friction and select the correct ones.
(i) Friction may cause moving objects to slow down.
(ii) A rough surface offers greater friction than a smooth surface.
(iii) Friction makes it easy to slide heavy objects across the floor.
(iv) Friction always acts in the opposite direction of motion of objects.

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


No it is wrong because friction always acts opposite of motion

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 6

Consider a 3 V cell, it is connected across two uniform resistance wires PQ and RS of resistance 1 Ω and 2 Ω respectively. Length of PQ is 3 cm and length of RS is 6 cm.

A voltmeter with one end fixed at point P and the other end connected to a jockey (J) slides from point R to point S. Which of the following diagrams represents reading of the voltmeter (V) as the jockey (J) slides? (x is the length from R to J.) (A voltmeter measures voltage and it allows almost no current to pass through it.)

A
B
C
D


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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 7

Read the given paragraph where few words have been italicised and select the correct option regarding them. Plant that derives nutrition from another plant is called parasite and the other plant is called host. Cuscuta is a partial parasite that prepares its own food and also depends on other plants for water and minerals. Mistletoe is a total parasite that is pale yellow in color and is often seen on tree tops.

AParasite and host must be interchanged.
BCuscuta must be replaced with Rafflesia.
CMistletoe and Cuscuta must be interchanged.
DNone of these


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