Download App

[ Question Bank ] - 2022 — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10Science[ Question Bank ] - 20225 Marks
Question
Read the given passage carefully and answer the questions.
We know that the force of gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force that we were applying on it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands, the only force that acts on it is the gravitational force of the earth and the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is in a free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to the acceleration due to the gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object and a buoyant force also acts on the object. Thus, true free fall is possible only in a vacuum.
1) Complete the following statement by choosing the right option.
The stone held in the hand is stable because on it __.
  1. two unbalanced forces are exerted.
  2. only the gravitational force of the earth is exerted.
  3. gravitational force of the earth is not exerted.
  4. two balanced forces are exerted.
2) Why does free fall not happen on the earth?
3) Why does the velocity of the object increase during the free fall?
4) Which type of force exerts on the object during free fall?
5) Why does free fall happen only in a vacuum?
✓

Answer

  1. The stone held in the hand is stable because on it two balanced forces are exerted.
  2. At the time of free fall on the earth, in addition to gravitational force, the object experiences force of friction due to air. Thus, the free fall cannot happen on the earth.
  3. The velocity of the object increases due to acceleration due to the gravity of the earth.
  4. During free fall only gravitational force is exerted on the object.
  5. Object experiences free fall when the only force acting on the object is a gravitational force. During free fall in air, the frictional force due to air opposes the motion of the object and a buoyant force also acts on the object. Thus, true free fall is possible only in a vacuum.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following questions: [5 M]" from [ Question Bank ] - 2022→[ Question Bank ] - 2022 — all question types→Science STD 10 question papers→Maharashtra Board STD 10 question papers→Maharashtra Board question paper generator→

Similar questions

A ball falls off a table and reaches the ground in $1$ s. Assuming g = 10 m/s^2, calculate its speed on reaching the ground and the height of the table.
→
How can we write mechanical power in a manner similar to the electrical power?
→
A thermally insulated pot has 150 g ice at temperature 0 °C. How much steam of 100 °C has to he mixed to it, so that water of temperature 50 °C will be obtained?
(Given: Latent heat of melting of ice = 80 cal/g, latent heat of vaporization of water = 540 cal/g, specific heat of water = 1 cal/g °C)
→
X, Y, and Z are three animals. The animal X can fly but animal Y can only run on ground or walls. The forelimbs of animals X and Y have the same basic design but they are used for different purposes such as flying and running respectively. The animal Z became extinct an long time ago. The study of fossils of Z tells us that it had some features like those of X and some like those of Y. In fact, Z is said to form a connecting link in the evolutionary chain of X and Y.
  1. What could the animals X, Y and Z be?
  2. What name is given to the forelimbs like those of X and Y which have the same basic design but different functions?
  3. Name one feature in which Z resembled X.
  4. Name one feature in which Z resembled Y.
  5. Which is the correct evolutionary chain involving X, Y and Z : X → Z → Y or Y → Z → X?
→
What is the valency of elements with atomic number 8, 14, 17 and 20?
→
How will you justify that overcoming the pollution is a powerful way of environmental management?###Why is it said that pollution control is important?
→
Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.
→
Give the reasons for increase in human disasters after the World War - II.
→
Write Short note:  Importance of medicinal plants.
→
In the following figure, an orbit of a planet around the Sun (S) has been shown. AB and CD are the distances covered by the planet in equal time. Lines AS ad CS sweep equal areas in equal intervals of time. Hence, areas ASB and CSD are equal. (Practice Activity Sheet-1)
(a) Which laws do we understand from the above description?
(b) Write the law regarding the area swept.
(c) Write the law $T^2 ∝ r^3$​​​​​​​ in your words.
Maharashtra Board Class 10 Science Solutions Part 1 Chapter 1 Gravitation 29
→