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PHYSICS [2 Mark Question Answer]

Motion · ICSE STD 7 (ICSE - English Medium). 13 questions.

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[2 Mark Question Answer]

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13 questions · timed · auto-graded

Question 12 Marks
Describe the types of motion of a screw when it is turned.
Answer
A turning screw has both rectilinear and rotatory motions. This is because while it is being rotated (rotatory motion), it is also getting pushed inwards (rectilinear motion) into the material.
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Question 22 Marks
A child walks 5 m straight from his house, then turns left and walks 12 m. He then walks 13 m straight back to his house. What is his displacement?
Answer
The displacement of the child will be zero.
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Question 32 Marks
A man walks at a speed of 1 m/s and covers a certain distance in some time. But, if he walks at a speed of 3 m/s, he covers an additional distance of 15 m in the same time. What is the distance he actually covered?
Answer
Let the original distance covered be $x m$.
Time taken to cover rmat the speed of $1 m / s = x$ seconds
Distance travelled in $x s$ at the speed of $3 m / s = x x\times 3=3x m$
According to the question, $3 x=x+15 \Rightarrow 2 x=15 \Rightarrow x=7.5$
Hence, the actual distance travelled is $7.5 m$.
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Question 42 Marks
There are two children riding a bicycle with the same speed on a straight road. Explain whether these children are at rest or in motion.
Answer
The children are said to be at rest with respect to each other. However, they are said to be in motion with respect to the surroundings.
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Question 52 Marks
Interpet the types of motion (uniform or non-uniform) from the information given in the following figures.
Image
Answer
1. Uniform motion
2. Non Uniform motion
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Question 72 Marks
How long will it take for an object moving with a speed of $5 \ m s^{-1}$ to cover a distance of $20 \ m?$
Answer
$\text { Speed of object }=5 ms ^{-1}$
$\text { Distance }=20 m$
$\text { Time }=\frac{\text { Distance }}{\text { Speed }}$
$=\frac{20}{5}$
$=4 \text { seconds }$
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Question 82 Marks
An express train moves at a speed of $60 \ km h^{-1}.$ How far will it travel in $3$ hours? ,
Answer
Speed of train $= 60 \ km \ hs^{-1}$
Time $= 3$ hours
Distance $=$ Speed $\times$ Time
$= 60 \times 3 = 180 \ km$
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Question 92 Marks
Calculate the speed of an object if it covers $200$ metres in $50$ seconds.
Answer
Distance covered $( x )=200 m$
Time taken $(t)=50 \sec$.
Speed $=\frac{x}{t}=\frac{\text { Distance }}{\text { Time }}$
$=\frac{200}{50}$
$=4$ seconds
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Question 102 Marks
An object moves from A to D along a rectangular path as shown in the given figure. Find :
a. the distance covered by the object.
b. the displacement of the object.
Image
Answer
a. Distance covered by the object = AB + BC + CD
= 10 km + 6 km + 10 km = 26 km
b. Displacement of the object = AD = 6 km
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Question 112 Marks
A man runs around exact half the circumference of a circular park of diameter 40 m. What is the displacement of the man ?
Answer
The man covers half the circumference of a circular park. This is equal to covering a semi-circle. Therefore, the displacement of the man is equal to the diameter of the park which is 40 m.
Image
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Question 122 Marks
Define translatory motion.
Answer
If an object moves in a line in such a way that every part of the object moves through the same distance in the same time interval, then the object is said to be in translatory motion. It is of two types – rectilinear and curvilinear.
Examples : Apple falling from a tree, earth moving around the sun.
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Question 132 Marks
Explain why a car driven on any city road is an example of a non-uniform motion.
Answer
The motion of a car moving on a busy road, is non-uniform motion because we have the frequency apply brakes and reduce acceleration on a busy road hence it does not cover equal distance in equal intervals of time.
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[2 Mark Question Answer] - PHYSICS STD 7 Questions - Vidyadip