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Vidaara.orgClass 8 · Mathematics
CodeVID-M08-09-BGC-01
Basic Geometrical Concepts - Assignment
Chapter: Basic Geometry
Topic: Basic Geometrical Concepts
Maximum Marks: 35
Time: 75 minutes
Name: ____________________ Roll No.: __________ Date: ____________

General Instructions

  • All questions are compulsory.
  • Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
  • Show all working for Sections B, C and D. Only final answers are given at the end — for full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions 5 × 1 = 5 marks
1.
A point has:
  • A.length only
  • B.no size
  • C.two ends
  • D.one end
2.
A line extends:
  • A.one way
  • B.endlessly both ways
  • C.not at all
  • D.in a circle
3.
A ray has:
  • A.no endpoints
  • B.one endpoint
  • C.two endpoints
  • D.three
4.
A line segment has:
  • A.no endpoints
  • B.one endpoint
  • C.two endpoints
  • D.infinitely many
5.
Angles are measured in:
  • A.metres
  • B.degrees
  • C.grams
  • D.litres
Section B — Short Answer (2 marks) 4 × 2 = 8 marks
6.
How many endpoints does a ray have?
7.
How many endpoints does a line segment have?
8.
A right angle measures how many degrees?
9.
A straight angle measures how many degrees?
Section C — Short Answer (3 marks) 4 × 3 = 12 marks
10.
Name the angle type for $45^\circ$.
11.
Name the angle type for $120^\circ$.
12.
How many degrees are there in a complete angle?
13.
An angle of $90^\circ$ is called:
Section D — Long Answer (5 marks) 2 × 5 = 10 marks
14.
Classify each angle as acute, right, obtuse, straight or reflex: $30^\circ, 90^\circ, 135^\circ, 180^\circ, 300^\circ$.
15.
Define point, line, ray and line segment in one line each.

Answer Key

Section A — Multiple Choice Questions
  1. (B) no size
  2. (B) endlessly both ways
  3. (B) one endpoint
  4. (C) two endpoints
  5. (B) degrees
Section B — Short Answer (2 marks)
  1. $1$.
  2. $2$.
  3. $90^\circ$.
  4. $180^\circ$.
Section C — Short Answer (3 marks)
  1. Acute.
  2. Obtuse.
  3. $360^\circ$.
  4. A right angle.
Section D — Long Answer (5 marks)
  1. Acute, right, obtuse, straight, reflex.
  2. Point: a location with no size; line: extends endlessly both ways; ray: starts at one point and extends one way; line segment: a part of a line with two endpoints.
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