Physics MCQS

801. If 100 N force is making angle 60 degrees with the y-axis then the value of the horizontal component is?
(A) 50 N
(B) 60 N
(C) 70.7 N
D) 86.6 N

802. A vector in space has components?
(A) 1
(B) 2
C) 3
(D) 4

803. The resultant of two vectors having magnitudes 12 N and 8 N cannot be?
(A) 2 N
(B) 10 N
(C) 16 N
D) 20 N

804. The resultant of two forces 30 N and 40 N acting parallel to each other is?
(A) 10 N
(B) 30 N
(C) 40 N
D) 70 N

805. The direction of a vector in a plane is described by an angle which the vector makes with _ and is in _.
(A) +ve x-axis, anti-clockwise
(B) -ve x-axis, anti-clockwise
(C) +ve y-axis, clockwise
D) -ve y-axis, anti-clockwise

806. If the magnitude of cross product and dot product of two vectors are equal. The angle between vectors is?
(A) 0 Degree
(B) 45 Degree
(C) 90 Degree
D) 180 Degree

807. If the measuring scale has a least count of 10 Kg then in 8,000 kg the significant figures are?
A. 4
B. 1
C. 3
D. 0

808. The numbers of the significant figures in all the given numbers 25.12, 2009, 4,156, and 1.257×10 -4 are?
A. 1
B. 3
C. 3
D. 4

809. Steradian is an angle of?
A. One dimension
B. Two dimensions
C. Three dimensions
D. Zero dimension

810. Which of the following quantity is dimensionless?
A. Gravitational constant
B. Plank’s constant
C. Power of lens and gas constant
D. Refractive index