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Punjab Group of Colleges Physics Pre-First Year Exam 2020: Test-2 Q&A, Exercises of Physics
The questions and answers for the physics section of the pre-first year (2020) f.sc / i.c.s. Test-2 exam conducted by the punjab group of colleges. Multiple-choice questions covering topics such as time, significant figures, dimensions, forces, and vector addition. Students are required to circle the correct answer and some questions have short answer components.
What you will learn
- Name three characteristics of scalar product.
- Why is it useful to have units for the amount of substance like the mole and kilogram?
- Add the masses 2.189kg, 0.089kg, 11.8kg, and 5.32kg.
- What is the minimum number of forces of unequal magnitude whose vector sum can be zero?
- What is the correct answer for the time taken by light from the sun to the earth?
- What are the dimensions of weight?
Typology: Exercises
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PUNJAB GROUP OF COLLEGES
Pre First Year (2020)
F.Sc / I.C.S. Test- 2
Physics Time Allowed: 60 min.
Maximum Marks: 30
Q.1 Encircle the correct answer cutting, overwriting result in loss of marks. (1 × 8 = 8 ) i. The time taken by light from sun to earth is: (A) 1 min 10 sec (B) 8 min 20 sec (C) 1 min 30 sec (D) 1 min 40 sec ii. When rounded off upto three significant figures the value 3.535 is written as: (A) 3.53 (B) 3. (C) 3.54 (D) 3. 55 iii. What are the dimensions of weight: (A) [MLT–^2 ] (B) [ML–^1 T–^2 ] (C) [ML–^1 T] (D) [MLT–^1 ] iv. The minimum number of forces of unequal magnitude whose vector sum can be zero is: (A) 2 (B) 3 (C) 4 (D) Infinite v. What is the resultant of 3N and 4 N forces acting at right angle to each other: (A) 1N (B) 5N (C) 7N (D) 12N vi. The self scalar product of
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A is given by: (A) A (B) A (C) A^2 (D) Zero
Roll No:___________
vii. Reverse process of vector addition is called: (A) Subtraction of vector (B) Resolution of vector (C) Multiplication of vector (D) None of these viii. The scalar product of
^
i and
^
j is: (A) Zero (B) One (C)
^
k (D) –
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k Q.2 Write the short answers of the following questions. (2 × 7 = 14 ) i. Write the dimensions of the following. (a) Pressure (b) Density ii. Name several repetitive phenomenon occurring in nature which could serve as reasonable time standards. iii. Add the following masses given in kg upto appropriate precision 2.189, 0.089, 11.8 and 5.32. iv. Why do we find it useful to have units for the amount of substance the mole and the kilogram. v. Define the terms (a) Unit vector (b) Null vector vi. Give three characteristics of scalar product. vii. A vector
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A lies in XY– plane. For what orientation will both of its rectangular components be negative. Q.3 Long Questions (a) Describe the method of addition of two vectors
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A and
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B by rectangular components. ( 5 ) (b) The length and width of a rectangular plate are measured 15.3 cm and 12.80cm respectively. Find the area of plate. (3)