**Sample Question Paper Mini Test Series**: ISRO Technical Assistant 5

**ISRO Mechanical Technical Assistant** **5**

**Part 5: List for questions and answers of Sample Question Paper (ISRO Technical Assistant)**

**Q1. A rotating fan completes 1200 revolutions every minute. If the tip of the blade is at a radius of 0.7 m, then the blade tip speed is (take Pie=22/7)**

a) 44 m/s

b) 22 m/s

c) 66 m/s

d) 88 m/s

**Q2. A can has a total volume of 1200 cubic cm and a mass of 200 g. How many grams of lead shots of density 11.4 g/cubic cm could it carry without sinking in water? (Density of water: 1 g/cubic cm)**

a) 800 g

b) 1200 g

c) 1140 g

d) 1000 g

**Q3. Which of the following statements are correct when related to a thermodynamic system?**

1) Internal energy is a property

2) Internal energy is path independent

3) Internal energy is path dependent

4) Internal energy is the area under the PV curve

a) 1 and 4

b) 1 and 2

c) 1 and 3

d) 2 and 4

**Q4. On a hot day at Chennai, an oil tanker was loaded with 40000 litres of diesel fuel. The tanker was then driven to Ooty where the temperature was 20 K lower than in Chennai and the entire load was delivered at Ooty. If the coefficient of volume expansion fo**

a) 40000 litres

b) 39000 litres

c) 40800 litres

d) 39200 litres

**Q5. Pressure intensity at a point in a fluid at rest is 4 N/square cm. The corresponding height of water would be (assume g = 10 m/square second)**

a) 4 m

b) 2 mm

c) 0.4 m

d) 40 m

**Q6. The head of water over an orifice of area 0.1 square meter is 5 m. The actual discharge in cubic meter per second if Cd=0.4 (assume g = 10 m/square second) is**

a) 0.4

b) 4

c) 2

d) 0.2

**Q7. Two mating spur gears have 40 and 120 teeth respectively. The pinion transmits a torque of 20 Nm rotating at 1200 rpm. The Torque transmitted by the gear is**

a) 6.6 Nm

b) 20 Nm

c) 40 Nm

d) 60 Nm

**Q8. A metallic body floats at the interface of mercury (of specific gravity 13.6) and water such that 40% of its volume is in Mercury and 60% in water. Total buoyant force ( in kN) experienced by body is (V=Volume of the floating body, g=10 m/square second)**

a) 60.4 V

b) 48.4 V

c) 30.2 V

d) Cannot be determined since density of floating body is not provided.

**Q9. The magnitude of the resultant of two equal coplanar forces acting at a point is equal to either of the forces. What is the angle between the forces?**

a) 45 degree

b) 90 degree

c) 60 degree

d) 120 degree

**Q10. A steel ball of mass 2.4 kg is tied to a string and whirled it in a horizontal plane in a circle of diameter 2 m at a constant speed of 20 rpm. The tension in the string is (ignore gravity)**

a) 5.0 N

b) 10.5 N

c) 100 N

d) 50.5 N

**Q11. A 10 kg Aluminium block is dragged on a plain horizontal surface at a constant velocity of 2 m/s. A frictional force of 60 N acts on it. What is the net force acting on the block?**

a) 60 N

b) 100 N

c) 160 N

d) 0 N

**Q12. A crane lifts a mass of 200 kg from rest and it attains an upward velocity of 3 m/s in 2 s uniformly. The tension in the supporting cable is**

a) 200 N

b) 2000 N

c) 300 N

d) 2300 N

**Q13. Two bodies m1 and m2 (m1>m2) have the same kinetic energy. Then their momentum p1 and p2 satisfy**

a) p1=p2

b) p1>p2

c) p1

d) p1=(-p2)

**Q14. The Earth, Jupiter, Saturn and Uranus all revolve around the Sun. The Earth takes 1 year, Jupiter takes 12 years, Saturn takes 30 years and Uranus takes 84 years to complete one revolution around the Sun. At what periodicity, all these four planets lineup**

a) 84 years

b) 168 years

c) 420 years

d) 1020 years

**Q15. Maximum power transmission in a belt is met when the total tension in the belt equals**

a) centrifugal tension

b) 2Pie times centrifugal tension

c) Thrice centrifugal tension

d) Half the centrifugal tension

**Q16. Ravi is attending an interview at Kochi which is 400 km from his home. He plans to leave home at 7.00 AM and drive at 100 km/hr so that he reaches for the interview scheduled at 11.00 AM on time. Ravi drives at that speed of 100 km/hr for the first 200 km,**

a) 100 km/hr

b) 180 km/hr

c) 160 km/hr

d) 140 km/hr

**Q17. A stone is dropped into a river from a stationary balloon 405 m above water. Another stone is thrown vertically down 1.00 s after the first is dropped. The stones strike the water at the same time. The initial speed of the second stone is (acceleration)**

a) 12.625 m/s

b) 16.625 m/s

c) 8.625 m/s

d) 10.625 m/s

**Q18. The head loss due to friction in a pipe of 1 m diameter and 1.5 km long when water is flowing with a velocity of 1 m/s is (Darcy's friction factor fd = 0.02 and acceleration due to gravity g=10 m/square second)**

a) 1.5 m

b) 0.5 m

c) 1 m

d) 2 m

**Q19. A stationary mass of gas is compressed without friction from an initial state of 0.3 cubic meter and 0.105 Mpa to a final state of 0.15 cubic meter and 0.105 Mpa, the pressure remaining constant during the process. There is a transfer of 37.6 kJ of heat fr**

a) (-21.85 kJ)

b) (3.85 kJ)

c) (-37.6 kJ)

d) (-15.75 kJ)

**Q20. A turner is turning a job of 350 mm long and 50 mm diameter at a cutting speed of 44 m/min. and a feed of 0.5 mm per revolution. The time required for one complete cut is (take Pie = 22/7)**

a) 2.5 minutes

b) 2 minutes

c) 4 minutes

d) 1 minute

**Part 5: List for questions and answers of Sample Question Paper (ISRO Technical Assistant)**

Q1 Answer d

Q2 Answer d

Q3 Answer b

Q4 Answer d

Q5 Answer a

Q6 Answer a

Q7 Answer d

Q8 Answer a

Q9 Answer d

Q10 Answer b

Q11 Answer d

Q12 Answer d

Q13 Answer b

Q14 Answer c

Q15 Answer c

Q16 Answer c

Q17 Answer d

Q18 Answer a

Q19 Answer a

Q20 Answer a