GATE XE purpose:exam-prep PYQs & Answers — Page 77

Questions 761–770 of 1772. Imported answers require independent review unless marked reviewed.

Consider a lawn sprinkler with horizontal arms of radius,

cm which has water introduced vertically through the centre, as shown in the figure. The exit area of the jet is 25 cm

and the jet velocity is 1 m/s. The water is ejected orthogonal to the sprinkler arm and the jet makes an angle of 60° with the horizontal plane. Find the torque (in N-m) required to hold the sprinkler stationary. Consider water density 1000 kg/m

. Neglect the effects of friction and gravity. (Round off to two decimal places)

Diagram for Engineering Sciences question 39

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A wooden cylinder (specific gravity = 0.6) of length

and diameter

floats in water (density 1000 kg/m

). Find out the minimum value of

for which the cylinder floats with its axis vertical. (Round off to three decimal places)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider a cart of mass 10 kg placed on an inclined plane (angle of inclination 60° with horizontal) as shown in the figure. A turning vane of negligible weight is mounted on the cart. A horizontal steady water jet is issued from a stationary nozzle of area 0.1 m

and strikes the turning vane as shown in the figure. The vane turns the jet downward parallel to the inclined plane. Find out the minimum jet velocity (in m/s) which will not allow the cart to come down. Neglect friction, consider density of water = 1000 kg/m

and acceleration due to gravity = 10 m/s

. (Round off to two decimal places)

Diagram for Engineering Sciences question 41

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A siphon is used to drain out water (density 1000 kg/m³) from a tank as shown in the figure. What can be the maximum height

(in meter) of the point C? Consider acceleration due to gravity = 10 m/s², pressure at point A = 10 kPa, vapour pressure of water = 29.5 kPa and neglect friction. (Round off to two decimal places)

Diagram for Engineering Sciences question 42

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The horizontal belt of negligible weight shown in the figure moves with a steady velocity (

) of 2.5 m/s and skims over the top surface of an oil-film of depth

= 3 cm. The length (

) and width (

) of the belt are, respectively, 2 m and 60 cm. Find the viscosity of the oil (in Pa-s), given that the minimum power required to move the belt is 100 W. Neglect the end effects. (Round off to two decimal places)

Diagram for Engineering Sciences question 43

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Number of atoms per unit area of the (110) plane of a body centered cubic crystal, with lattice parameter 'a', is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the following materials with their corresponding bonding types.

Material	Bonding
P: Cu₀.₅Al₀.₅	1: Ionic
Q: ZnS	2: Covalent
R: Na₂O	3: Metallic
S: Li₄SiO₄	4: Mixed

Your answerChoose one option.

P - 4; Q - 2; R - 3; S - 1

P - 3; Q - 4; R - 2; S - 1

P - 3; Q - 2; R - 1; S - 4

P - 3; Q - 1; R - 4; S - 2

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In an ideal rubber, the primary factor responsible for elasticity up to small strains is

Your answerChoose one option.

Change in both enthalpy and entropy

Change in enthalpy, but no change in the entropy

No change in enthalpy, but change in the entropy

Neither a change in enthalpy, nor a change in the entropy

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which one of the following statements is true for an intrinsic semiconductor?

Your answerChoose one option.

Electrical conductivity increases with increasing temperature and pressure

Electrical conductivity increases with increasing temperature and decreasing pressure

Electrical conductivity increases with decreasing temperature and increasing pressure

Electrical conductivity increases with decreasing temperature and pressure

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A differential scanning calorimetry (DSC) experiment tracks the heat flow into or out of a system as a function of temperature. If the experiments given in the options below are performed at 1 atmospheric pressure, then in which case will the DSC thermogram exhibit a spike, either upward or downward?

Your answerChoose one option.

Heat 10 mg of pure Cu from 323 K to 673 K

Cooling pure water from 323 K to 278 K

Heat pure ice from 263 K to 284 K

Cooling a Pb-Sn alloy at the eutectic composition from 323 K to 273 K

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XE purpose:exam-prep PYQs

Question 39

Question 40

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48