10 Class Science Pre Board Exam 2024-25: St. Margaret School

10th Science Pre Board – I Examination 2024-25: St. Margaret Sr. Sec. School, Prashant Vihar, Sector 14, Rohini, Delhi-85 India

School Name:	St. Margaret Sr. Sec. School, D-BLOCK, Prashant Vihar, Sector 14, Rohini, New Delhi 110085 India
Class:	10th Standard (CBSE) – Pre Board – I Examination 2024-25
Subject:	Science
Time Duration:	02 Hours
Maximum Marks:	50
Date:	08 November, 2024

General Instructions: 10th Science Pre-board Test

Important Instructions:

1. The question paper contains five sections A, B, C, D and E. There are 20 questions in the question paper.
2. Section A – Questions no. 1 to 8 are of one mark each. These questions contain multiple choice questions (MCQ) and assertion-reason questions.
3. Section B – Question no.9 to 11 is short answer questions, carrying 2 marks each.
4. Section C – Questions no. 12 to 14 is short answer questions carrying 3 marks each.
5. Section D – Questions no.15 to 17 are long answer questions, carrying 5 marks each.
6. Section E – Question no. 18 to 20 is case based study questions.
7. There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
8. Wherever necessary, neat and properly labeled diagrams should be drawn.

Section – A

Question 01. If four identical resistors of resistance 8Ω, are first connected in series so as to give an effective resistance Rs then connected in parallel so as to give an effective resistance Rp, then the ratio Rs/Rp is

1. 32 Ω
2. 2 Ω
3. 0.5 Ω
4. 16 Ω

Question 02. When light enters the atmosphere, it strikes on extremely fine particles, which deflect the rays of light in all possible directions, this is due to

1. reflection of light
2. atmospheric refraction
3. scattering of light
4. dispersion of light

Question 03. Which among the following alloys curtain mercury as one of its constituents?

• Stainless steel
• Brass
• Solder
• Zinc amalgam

Question 04. The electronic configurations of three elements X, Y and Z are X -2, 8; Y-2, 8,7 and Z – 2, 8, 2. Which of the following is correct?

1. X is a metal
2. Y is a metal
3. Z is a non-metal
4. Y is a non-metal and Z is a metal

Question 05. The simple animals like Planaria can be cut into a number of pieces and each piece grows into a complex organism. What Is the process known as?

1. Budding
2. Fragmentation
3. Spore formation
4. Regeneration

For questions number 6 to &, two statements are given – one labelled Assertion(A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below

(a) Both Assertion and Reason are true and Reason is the correct explanation of the assertion.