CBSE Class 3 Science NSO Olympiad MCQs with Answers Set I

MENTAL ABILITY

Question. What was the time 3 hours 50 mins ago, if the current time shown by the clock is 10:30?
(A) 5:40
(B) 6:40
(C) 6:30
(D) 7:40
Answer : B

Question. If you count in 5s, starting with 3, the sequence looks like this :
3, 8, 13, .........
What is the 15th number in this sequence?
(A) 73
(B) 78
(C) 63
(D) 68
Answer : A

Question. Which item is the heaviest ?

(A) Eraser
(B) Pen
(C) Stapler
(D) Bag
Answer : D

Question. Match the multiplications given in Column-I with their results in Column-II.
Column-I         Column-II
(a) 49 × 31       (i) 1197
(b) 63 × 19       (ii) 3496
(c) 42 × 29       (iii) 1519
(d) 92 × 38       (iv) 1218
(A) (a) - (iii); (b) - (i); (c) - (ii); (d) - (iv)
(B) (a) - (iii); (b) - (i); (c) - (iv); (d) - (ii)
(C) (a) - (iii); (b) - (ii); (c) - (i); (d) - (iv)
(D) (a) - (iii); (b) - (iv); (c) - (i); (d) - (ii)
Answer : B

Question. Which of the following has 1/2 of its contents shaded?

(A) Q
(B) P
(C) R
(D) S
Answer : A

Question. Which of the following options makes the given number sentence true ?
729 → Divided by 3 → Multiply by 5 → ? = 1210
(A) Add 5
(B) Divided by 5
(C) Minus 5
(D) No need of any operation
Answer : C

Question. Digit at the tens place in the number that comes as a difference between 5 hundreds 6 tens 13 ones and 7 hundreds 2 tens 15 ones is _________.
(A) 7
(B) 6
(C) 5
(D) 4
Answer : B

Question. _______ are needed to make ` 595.
(A) Five ` 100 note and nine ` 5 note
(B) Ten ` 50 note and nine ` 10 note
(C) Ten ` 5 note and one ` 100 note
(D) Five ` 100 note and nineteen ` 5 note
Answer : D

Question.

(A) 5
(B) 4
(C) 3
(D) 6
Answer : A

Question. Find the correct mirror image of the figure (x), if mirror is placed vertically to the left.

Answer : D

science

Question. Ritesh drove and reached his home at about 4.00 pm. He wanted to find a park that would have the most shade. Which of the car parks should he choose to park his car?

(A) Park P
(B) Park Q
(C) Park R
(D) Park S
Answer : C

Question. Study the given classification chart. Which of the following sets of headings for groups D, E and F is/are correct?

(A) X only
(B) Y only
(C) X and Y
(D) Y and Z
Answer : B

Question. In addition to stem, branches and leaves, the shoot of a plant bears _______.
(A) Fruits
(B) Flowers
(C) Buds
(D) All of these
Answer : D

Question. Sandhya observed the Moon from 14 January to 28 January. She noted that the Full Moon appeared on 18th January. Which of the following options most correctly shows the phases of the Moon Sandhya observed on 14th January and 28th Januaryrespectively?

Answer : B

Question. Which beak belongs to the bird that drinks nectar from flowers ?

Answer : C

Question. Richa has prepared a model to create coloured smoke as shown in the figure.

Working of this model depends upon which of these principles?
(A) Hot water is lighter than cold water.
(B) Hot water is heavier than cold water.
(C) Cold water rises over hot water.
(D) Cold water expands more than hot water.
Answer : A

Question. The given picture shows a river flowing downstream towards the sea. Situated near the river is a factory which occasionally discharges waste water into the river and, a farm where pesticide is used. A water treatment plant which supplies water for home use is to be built. The water treatment plant treats water which is pumped into it from the river. Which position would be suitable for the treatment plant?

(A) P
(B) Q
(C) R
(D) S
Answer : D

Question. Which one of the following questions could all these pupils answer?

(A) Is the orchid purple or blue?
(B) Is the watch ticking or not?
(C) Is the coffee cold or hot?
(D) Is the soap scented or not?
Answer : C

Question. Select the odd one out based upon their life forms.
(A) Silkmoth
(B) Dragonfly
(C) Mosquitoes
(D) Housefly
Answer : B

Question. Which of these actions will help in keeping environment clean?

Answer : C

Question. Which of these actions requires both push and pull forces?

Answer : C

Question. Study the given food web and select the correct number of food chains that consist of only three organisms.

(A) 4
(B) 5
(C) 7
(D) 8
Answer : D

Question. Refer the given diagram of the human digestive system and answer the following question.
Which of the labelled parts
(i) contains digestive juices?
(ii) contains semi-solid wastes called faeces?

     (i)    (ii)
(A) E    H
(B) F    G
(C) F    H
(D) I     G
Answer : B

Question. A man standing 150 m away from a cliff fires a gun. A second man who is standing 300 m further away from first man hears the gun 1 second after he sees the flash. The second man will hear the echo from the cliff _______.

(A) 1 second after seeing the flash
(B) 2 seconds after hearing the gun
(C) 2 seconds after seeing the flash
(D) 4 seconds after hearing the gun
Answer : C

Question. A plastic bin has a capacity of 1500 cm³. 2500 cm³ of air is pumped into it.
What will be the volume of air inside the plastic bin?
(A) 1000 cm³
(B) 1500 cm³
(C) 2500 cm³
(D) 3500 cm³
Answer : B

Question. A note is shown which Shekhar made about different types of houses. Unfortunately, when he had finished writing, accidentally some water spilt over the page and smudged some of the keywords.

Select the correct sequence of smudged words to complete the note.
(A) Nomads, Tent, Caravans, Kutcha
(B) Igloo, Caravans, Tent, Pucca
(C) Igloo, Caravans, Tent, Kutcha
(D) Nomads, Tent, Caravans, Stilt
Answer : D

Question. Study the given family tree. X and Y are Adi's maternal grandparents. He has ________ sibling(s).

(A) No
(B) One
(C) Three
(D) Four
Answer : A

Question. Which of the following diagrams shows the correct way of reading a thermometer?

Answer : D

Question. Why do you think stone pebbles are placed around trees in urban area instead of paving solid concrete around the trees?

(A) The stone pebbles help to support the roots of the trees.
(B) The stone pebbles allow the trees to grow neatly.
(C) The stone pebbles allow air and water to get to the roots of the trees.
(D) The stone pebbles allow the leaves to fall through the gaps and fertilize the trees.
Answer : C

Question. Which one of the following statements is true for the given plant?

(A) The plant has strong and thick stem.
(B) The plant has tendrils to get support.
(C) The plant can live in dry conditions.
(D) The plant does not make its own food.
Answer : B

Question. In order to grow a new money plant, you should cut the plant at the place indicated by line ______.

(A) P
(B) Q
(C) R
(D) S
Answer : A

Question. Select the correct match.
(A) Spinal cord - Reproductive system
(B) Aorta - Circulatory system
(C) Heart - Nervous system
(D) Windpipe - Digestive system
Answer : B

Question. Select the incorrect statement.
(A) Planets reflect the light of the Sun that falls on them.
(B) Rotation of the Earth on its axis causes days and nights.
(C) The group of planets are called constellations.
(D) A satellite is an object that moves around a planet.
Answer : C

Question. In winters, you must have observed that people rub their hands together to generate heat in the hands. How does heat generate?

(A) Movement of hands gains heat from the surroundings.
(B) Friction against movement of hands generates heat energy.
(C) Heat travels from the surrounding to the hands.
(D) All of these
Answer : B

Question. Select the incorrect comparison between solid and liquid.
               Solid                                                                 Liquid
(A) It has definite size.                                       It doesn't have any definite size.
(B) It doesn't have definite volume.                   It has definite volume.
(C) It doesn't flow easily.                                    It flows easily.
(D) It doesn't take the shape of the container.   It takes the shape of the container.
Answer : B