DRAUGHTSMAN CIVIL WORKSHOP CALCULATION & SCIENCE- IV Semester

MODEL EXAM

DRAUGHTSMAN CIVIL

WORKSHOP CALCULATION & SCIENCE- 

Semester IV

1. Centre of area of plane geometrical figure is termed as……………..

(a) centre       (b)centre of gravity       (c) centroid      (d) all of these

 2.     The C.G.  of any triangle is at a point of height of triangle  from the base of triangle

(a)1/3 of height     (b)2/3 of height  (c)1/4 of height   (d) none of these

3.    Area of semicircle having radius r is given by……………

 (a)                      (b)                           (c)                         (d)

4.     Unit of heat is ……………………

(a)joule            (b)calorie         (c)degree  (d)Fahrenheit

5.  Area of a sector of a circle whose radius is 14cm and the length of the arc of the sector is 28cm is

(a) 0.1194cm         (b)3.422cm        (c)124.727cm        (d)1.711cm

6. The ratio of the limiting force of friction (F) to the normal reaction (R) is known as

(a)Coefficient of friction         b)Force of friction       (c)Angle of friction      (d)None of the above

7. The imaginary line joining  the two poles of a magnet  is called …………….

(a)Magnetic neutral axis       (b)magnetic axis    (c)magnetic line of forces   (d)none of these

8. If cosɵ=4/5 then cotɵ is equal to ………………………

(a)4/3                     (b)3/4               (c)4/5       (d)3/5

9. Copper is good ……………. of electricity

(a) insulator        (b)resistor       (c)conductor        (d)none of these

10………..are commonly used to control speed or to change the direction

(a) belt wheel       (b) gear wheel      (c) drive gear     (d)  belt drive

11. In a simple machine the velocity ratio is found to be 20.  An effort of 20kg required to lift the load of 400kg. The efficiency of machine is ………….

(a) 100                 (b) 80                   (c) 40               (d) 20

12. The force exerted per unit area of a substance is called …………

(a) density            (b) pressure           (c) stress            (d) strain

13. The atmospheric pressure on the gauge scaled is marked as ………….

(a) 20                  (b) 10             (c) 0           (d)-20

14……………… is the form of an energy

(a) Temperature       (b)  electricity                (c) gas           (d) heat

15.The process by which hear is transmitted from one point to another  through the direction  fall of temperature is called ………….

(a) transmission             (b)conduction     (c) convection     (d)radiation

16.Heat is transmitted from  one place to another  without the aid of material medium is called ……………….

(a) transmission             (b)conduction     (c) convection     (d)radiation

17.The flow of electrons  in any conductor is called ……………….

(a)resistance     (b) ampere      (c)volt                 (d)current

18.The  force which  causes  to flow  the free electrons in any closed circuit  due to difference in electrical potential is called …………..

(a)electro motive force     (b) potential difference     (c)electricity     (d) none of these

19.The lines of magnetic force  that emerge  from the north pole of a magnet  is known as …………

(a)magnetic strength     (b) magnetic south    (c)magnetic flux density     (d)magnetic flux

20.The maximum value of frictional force  before the body just slides over the surface of another body is called ………….

(a)rolling friction     (b) limiting friction     (c)force of friction    (d) sliding frictiom

WORKSHOP CALCULATION & SCIENCE

Choose the correct answer. Each question carries 3 marks.

1) (𝑥²𝑦³)² =.....................

A) 𝑥⁴𝑦⁵                               B) 𝑥⁴𝑦⁶                                                C) 𝑥⁴𝑦³                               D) 𝑥²𝑦⁶

2)  =…………..

A) 𝑥⁻²𝑦⁻²                           B) 𝑥⁻²𝑦⁻⁶                            C) 𝑥⁻⁶𝑦⁻²                           D) 𝑥⁻⁶𝑦⁻⁶

3) (2𝑥²4𝑦²)^{2 =}.............

A) 64𝑥²𝑦²                        B) 8𝑥⁴𝑦⁴                            C) 64𝑥⁴𝑦⁴                                    D) 6𝑥𝑦⁴

4) Solve t² - 2t + 1 = 0

A) 1                             B) -1                            C) 1, -1                        D) 0

5) Solve x² = x + 20

A) -5, 4                        B) 5, -4                        C) 5, 4                         D) -5, -4

6) A resistor of 10 Ω, an inductor of 0.3H and a capacitor of 100 µF are connected in series across a 230V, 50 Hz mains. Calculate the total current.

A) 4.6A                       B) 3.2A                       C) 4.2A                       D) 3.6A

7) Formula of instantaneous value of current is.........

A) i = I_av sin 2wt         B) i = I_m sin 2wt          C) i = I_m 2sin wt         D) i = I_m sin wt

8) If 24 cells of 1.5V emf each are connected in series, calculate the total emf.

A) 25.5V                                 B) 16V                        C) 36V                                    D) 22.5V

9) RMS value of AC is 12mA. What will be its average value?

A) 12.1mA                  B) 10.8mA                  C) 11.9mA                  D) 7.6mA

10) Three resistors of 5 Ω, 10 Ω and 15 Ω are connected in parallel across a 120V source. Calculate the total current through the circuit.

A) 18.8A                     B) 34A                                    C) 44A                                    D) 12.5A

11) Calculate the total capacitance if 20µF, 30µF and 40µF capacitors are connected in parallel.

A) 9.2 µF                    B) 90 µF                      C) 53.85 µF                D) 0.108 µF

12) Convert 12kW into HP (British System)                            

A) 16.08 HP                B) 8.9 HP                    C) 16.31 HP                D) 8.826 HP

13) The property of a material to regain its original shape after the removal of the external load is...........

A) Plasticity                B) Elastic body                       C) Elasticity                D) Elastic body

14) Unit of stress in MKS system is..........

A) dynes/cm²                   B) N/cm²                            C) N/m²                              D) dynes/cm²

15) A metal wire is 2.5mm diameter and 2m long. A force of 12N is applied to it and it stretches 0.3mm. Assume the metal is elastic. Determine the Young's modulus of the wire.

A) 1.5 x 10⁴ N/mm²      B) 1.6 x 10⁴ N/mm²      C) 1.7 x 10⁴ N/mm²      D) 1.8 x 10⁴ N/mm²

16) The process of adding controlled impurities to an intrinsic semiconductor is............

A) Banding                 B) Insulating               C) Doping                   D) Di-electric

17) Which of the following is not a type of conductor?

A) Bare                       B) Insulated                C) horse-shoe              D) stranded

18) The instrument used to measure insulation resistance is........

A) Ammeter                B) Voltmeter               C) Megger                   D) CRO

19) ................ is an example for intrinsic semiconductor.

A) Boron                     B) Germanium                        C) Phosphorus                        D) Aluminum

20) Unit of magnetic flux in SI system is..........

A) maxwell                 B) weber                     C) tesla                                    D) gauss

21) The property of a magnetic circuit which opposes the establishment of magnetic flux in it is called...........

A) Permeability                       B) Non-hydroscopic   C) Reluctance             D) mmf

22) The type of magnet used in relays, solenoid etc. is..............

A) Bar magnet                        B) Ring magnet                       C) Horse-shoe magnet            D) Electromagnet

23).............. is the device used to measure atmospheric pressure.

A) Manometer             B) Barometer              C) SphygmomanometerD) Pressure gauge

24) 1 bar = .................Pa

A) 10³ Pa                     B) 10⁴ Pa                     C) 10⁵ Pa                     D) 10⁶ Pa

25) The process of heating hardened steel to a suitable temperature is called.........

A) Annealing              B) Hardening              C) Normalizing                       D) Tempering