Physics questions with answers

2,629 multiple-choice questions. Open any question for its answer and explanation.

Questions asked in State PSC and UPSC prelims, by topic. Each topic also has notes to read.

Read the notes: Mechanics →

26. The life of a ball bearing at a load of 10 kN is 8000 hours. Its life in hours, if the load is increased to 20 kN, keeping all other conditions same, is : - Question not attemptedAsked in Assistant Eng. (Mechanical) Competitive Examination, 2023
27. A bolted joint is so designed that the stiffness of a threaded portion (K₁) is equal to the stiffness of unthreaded portion (K₂) of the bolt in a clamped region, then combined stiffness (effective) (Kₑ) of the bolt is given by - Question not attemptedAsked in Assistant Eng. (Mechanical) Competitive Examination, 2023
28. Complex potential is defined as - $\phi + i\psi$ - $\phi - i\psi$ - $\psi + i\phi$ - $\psi - i\phi$Asked in Local Self Government Dept. Exam 2022
29. A Propped cantilever beam is loaded with uniformly distributed load on whole span such that that deflection at prop end of the beam is zero. The reaction of the prop end of the beam is calculated by (Take usual notations for all quantities). - (1) $\frac{3}{8} wl$ - (2) $\frac{7} {8} wl$ - (3) $\frac{5}{8} wl$ - (4) $\frac{5}{7} wl$Asked in Local Self Government Dept. Exam 2022
30. A two span continuous beam is simply supported by three supports A, B and C from left to right respectively and subjected to U.D.L. of w kN/m throughout the span. Then negative moment will be generated atAsked in Local Self Government Dept. Exam 2022
31. Three steel plates are held together by 14 mm diameter rivet. If the load transmitted is 88 kN through this arrangement, estimate the shearing stress in the rivet. - (1) $\frac{4 \times 10^3}{7}$ - (2) $\frac{2 \times 10^3}{7}$ - (3) $ \frac{3 \times 10^3}{7}$ - (4) $\frac{7 \times 10^3}{2}$Asked in Local Self Government Dept. Exam 2022
32. The displacement of joints is selected as redundant in which method of structural analysis ?Asked in Local Self Government Dept. Exam 2022
33. What is the maximum length of open gantries beyond which expansion joint shall be provided ?Asked in Local Self Government Dept. Exam 2022
34. If M25 grade concrete is used as a bedding material for a steel column, then the maximum bearing pressure shall be limited toAsked in Local Self Government Dept. Exam 2022
35. What is the ratio of most unfavourable slenderness of each member between the intermediate weld connection of two channel section connected back to back if the most unfavourable ratio of slenderness of the member as a whole is 90 ?Asked in Local Self Government Dept. Exam 2022
36. When transverse stiffeners are provided in plate girder is connected along one longitudinal edge only then the minimum thickness of web shall be taken as - (1) $\frac{d}{200 \varepsilon_{w}}$ - (2) $\frac{d}{340 \varepsilon_{w}}$ - (3) $\frac{d}{90 \varepsilon_{w}}$ - (4) $\frac{d} {400 \varepsilon_{w}}$Asked in Local Self Government Dept. Exam 2022
37. What is the minimum vertical distance between the rows of bars if the beam is constructed with 20 mm size aggregate and reinforced with 12 mm diameter bars ?Asked in Local Self Government Dept. Exam 2022
38. If 300 mm $\times$ 600 mm rectangular beam cast with M25 grade concrete is subjected to flexure, then the moment of the beam isAsked in Local Self Government Dept. Exam 2022
39. What is the depth of rectangular portion in stress block diagram of concrete? - (1) $\frac{4} {7} X_{u}$ - (2) $\frac{3}{7} X_{u}$ - (3) $ \frac{2}{7} X_{u}$ - (4) $\frac{5}{7} X_{u}$Asked in Local Self Government Dept. Exam 2022
40. The nominal shear stress should not exceed __________ for solid slab constructed with M40 grade concrete.Asked in Local Self Government Dept. Exam 2022
41. The maximum spacing of shear reinforcement for 230 mm wide and 350 mm deep (effective) beam shall not exceed __________ when inclined stirrups is provided at 45°Asked in Local Self Government Dept. Exam 2022
42. The strength of compression members subjected to helical reinforcement is about __________ percent more than the strength of similar member with lateral ties.Asked in Local Self Government Dept. Exam 2022
43. Which of the following criteria is considered while proportioning the size of footing ? - (1) $ \frac{P}{A}+\frac{M}{Z}A.B.P.$ and $\frac{P} {A}-\frac{M}{Z} \le 0$ - (4) $\frac{P}{A}- \frac{M}{Z}>A.B.P.$ and $\frac{P}{A}+ \frac{M}{Z} \le 0$Asked in Local Self Government Dept. Exam 2022
44. The development length of each bar of bundled bars shall be taken as ____ that of individual bar when four bars in contact.Asked in Local Self Government Dept. Exam 2022
45. Diagonal tension in a beam A) Is maximum at neutral axis B) Decreases below the neutral axis and increases above the neutral axis C) Increases below the neutral axis and decreases above the neutral axis D) Remains sameAsked in ASSISTANT AUDIT OFFICER 2017 18 2017
46. To minimise the effect of differential settlement, the area of a footing should be designed for A) Dead load only B) Dead load + live load C) Dead load + fraction of live load D) Live load + fraction of dead loadAsked in ASSISTANT AUDIT OFFICER 2017 18 2017
47. The main reinforcement of an RCC slab is designed for 10 mm diameter bars @100 mm spacing. Now it is required to replace 10 mm bars by 12 bars, then the spacing of 12 mm bars should beAsked in Civil Engg GA 24 2023 CO 1505 2024
48. In mix design for M25, the target mean strength of concrete as per IS : 10262-2009 (take standard deviation = 5 N/mm²) isAsked in Civil Engg GA 24 2023 CO 1505 2024
49. The constant factor relates stress in the steel with the stress in adjoining concrete isAsked in Civil Engg GA 24 2023 CO 1505 2024
50. IS-456 : 2000 specifies the modulus of elasticity of concrete ($E_c$) asAsked in Civil Engg GA 24 2023 CO 1505 2024