Vidaara.orgClass 9 · Mathematics
CodeVID-M09-21-EXL-01
Exponential & Log Form - Assignment
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.
If $a^x=N$, then:
- A.$\log_N a=x$
- B.$\log_a N=x$
- C.$\log_a x=N$
- D.$\log_x N=a$
2.
$\log_2 8=$
- A.$2$
- B.$3$
- C.$4$
- D.$8$
3.
$\log_a 1=$
- A.$0$
- B.$1$
- C.$a$
- D.undefined
4.
$\log_a a=$
- A.$0$
- B.$1$
- C.$a$
- D.$2$
5.
$\log_{10} 100=$
- A.$1$
- B.$2$
- C.$10$
- D.$100$
Section B — Short Answer (2 marks)
4 × 2 = 8 marks
6.
Write $2^3=8$ in logarithmic form.
7.
Write $\log_3 9=2$ in exponential form.
8.
Evaluate $\log_5 25$.
9.
Evaluate $\log_{10} 1000$.
Section C — Short Answer (3 marks)
4 × 3 = 12 marks
10.
Evaluate $\log_2 32$.
11.
Evaluate $\log_3 81$.
12.
If $\log_2 x=4$, find $x$.
13.
Evaluate $\log_7 1$.
Section D — Long Answer (5 marks)
2 × 5 = 10 marks
14.
Convert to logarithmic form: $4^3=64$ and $10^{-2}=0.01$.
15.
Evaluate $\log_2\tfrac18$ and $\log_9 3$.
Answer Key
Section A — Multiple Choice Questions
- (B) $\log_a N=x$
- (B) $3$
- (A) $0$
- (B) $1$
- (B) $2$
Section B — Short Answer (2 marks)
- $\log_2 8=3$.
- $3^2=9$.
- $2$.
- $3$.
Section C — Short Answer (3 marks)
- $5$.
- $4$.
- $16$.
- $0$.
Section D — Long Answer (5 marks)
- $\log_4 64=3$ and $\log_{10} 0.01=-2$.
- $-3$ and $\tfrac12$.
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