RBSE Class 6 Maths Important Questions Chapter 5 Understanding Elementary Shapes

Rajasthan Board RBSE Class 6 Maths Important Questions Chapter 5 Understanding Elementary Shapes Important Questions and Answers.

RBSE Class 6 Maths Chapter 5 Important Questions Understanding Elementary Shapes

Multiple Choice Questions

Question 1.
The vertex of an angle lies :
(a) in its interior
(b) in its exterior
(c) on the angle
(d) inside the angle
Answer:
(c) on the angle

Question 2. 
A perpendicular drawn from a vertex to the opposite side of a triangle is known as :
(a) an altitude 
(b) a line
(c) an angle
(d) a line segment
Answer:
(a) an altitude 

Question 3. 
An angle of measures 90° is called:
(a) a complete angle
(b) a right angle
(c) a straight angle
(d) a reflex angle
Answer:
(b) a right angle

Question 4.
An angle of measure 180° is called :
(a) a zero angle
(b) a right angle
(c) a straight angle 
(d) a reflex angle
Answer:
(c) a straight angle 

Question 5. 
If bicycle wheel has 36 spokes, then the angle between a pair of adjacent spokes is :
(a) 10°
(b) 15°
(c) 20°
(d) 12°
Answer:
(a) 10°

Question 6.
The number of degrees in 4/3 right angles is :
(a) 180° 
(b) 360°
(c) 270°
(d) 120°
Answer:
(d) 120°

Question 7.
An angle of measure 290° is :
(a) an acute angle
(b) a straight angle
(c) a complete angle
(d) none of these
Answer:
(d) none of these

Fill in the Blanks :

Question 1.
The shape of a playing dice is __________
Answer:
cube

Question 2. 
A prism has  __________ identical bases.
Answer:
two

Question 3.
The number of vertices of a sphere whose edges are all of equal length is __________
Answer:
zero

Question 4.
Two adjacent faces of a cuboid meet in a line segment called is __________
Answer:
edge

Question 5.
__________ edges of a cube (or cuboid) meet at each of its vertices.
Answer:
Three.

State whether True or False

Question 1.
Number of faces in a cuboid and the number of faces in a cube are not equal.
Answer:
False

Question 2. 
A lunch box is an example of a cube.
Answer:
False

Question 3.
A triangle whose two sides are equal is known as scalene triangle.
Answer:
False

Question 4.
A triangle whose one angle is a right angle, is known as right-angled triangle.
Answer:
True.

Very Short Answer Type Questions

Question 1.
You are standing in a room facing north. In what direction are you facing after making a quarter turn?
Answer:
After making a quarter turn or a turn of 90°, I will be facing east if I turn to my right hand. Similarly, if I turn to my left hand, I will be facing west.

Question 2.
A bicycle wheel makes four and a half turns. Find the number of right angles through which it turns.
Answer:
In one turn, the wheel of a bicycle covers 360°. 
If we express 360° in right angles, we get 360°/90° = 4 right angles.
Thus, in four turns, the wheel will turn by (4 x 4.5) = 18 right angles.

Short Answer Type Questions 

Question 1.
Draw a diagram to represent a cube. Label its vertices as A, B, C, D, E, F, G, and H. Now write the names of its faces and edges.
Answer:
The cube given below :

A cube has 6 faces and 12 edges :
Faces - ABCD, EFGH, BCGF, ADHE, ABFE and CDHG.
Edges -AB, BC, CD, DA, EF, FG, GH, HE, BF, CG, AE, and HD.

Question 2. 
Explain the following terms :
1. Triangle
2. Parts or elements of a triangle,
3. Scalene triangle,
4. Isosceles triangle,
5. Equilateral triangle,
6. Acute triangle,
7. Right triangle,
8. Obtuse triangle.
Answer:
1. Triangle : A triangle is a closed polygon that consists of three straight lines as its sides.
2. Parts or elements of a triangle : A triangle consists of three sides, three angles and three vertices.
3. Scalene triangle : A triangle in which the length of all the sides are different.
4. Isosceles triangle : A triangle in which the length of two sides are equal.
5. Equilateral triangle : A triangle in which the length of all the sides are equal.
6. Acute triangle : A triangle in which all the angles measure less than 90°.
7. Right triangle : A triangle which has an angle that measure 90°.
8. Obtuse triangle : A triangle in which one of the angles measure more than 90°.

Question 3.
A ship sailing in a river moves towards east. If it changes to north, through what angle does it turn?
Answer:
If the ship is sailing in east direction and turns to north direction, it turns through an angle of 90°.