Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

JEE Physics Solved Question Paper 2014

Multiple Choice Questions

11.

A car moves from A to B with a speed of 30 km/h and from B to A with a speed of 20 km/h. What is the average speed of the car ?

25 km/h
24 km/h
50 km/h
10 km/h

12.

A body starts from rest and moves with constant acceleration for t sec. It travels a distance x₁ in first half of time and x₂ in next half of time, then

x₂ = x₁
x₂ = 2x₁
x₂ = 3x₁
x₂ = 4x₁

13.

What is the source temperature ofthe Carnot engine required to get 70% efficiency ? Given, sink temperature = 27°C.

1000°C
90°C
270°C
727°C

14.
A 10 kg metal block is attached to a spring of spring constant 1000 Nm^-1. A block is displaced from equilibrium position by 10 cm and released. The maximum acceleration of the block is

10 ms^-2

100 ms^-2

200 ms^-2

0.1 ms^-2

10 ms^-2

We know thatsprmg does SHM

So, the restoring force is proportional to displacement

i.e, F = − mω²y ...... (i)

F = − ky ....... (ii)

where k = force constant of the spring

m = 10 kg

A = 10 cm = 0.1 m

Comparing the both equation, we get

$ω^{2} = \frac{k}{m} \Rightarrow ω = \sqrt{\frac{k}{m}} = \sqrt{\frac{1000}{10}} = 10 rad / s$

and acceleration in SHM

a_max = − ω² y

where ω²is constant.

= − 10² × (0.1) = − 10 m/s² = 10 ms^-2

15.

A metallic wire of 1 m length has a mass of 10 x 10^-3 kg. If a tension of 100 N is applied to a wire, what is the speed of transverse wave ?

100 ms^-1
10 ms^-1
200 ms^-1
0.1 ms^-1

16.

A trainis approaching towards a platform with a speed of 10 ms^-1 while blowing a whistle of frequency 340 Hz. What is the frequency of whistle heard by a stationary observer on the platform ? Given speed of sound = 340 ms^-1.

330 Hz
350 Hz
340 Hz
360 Hz

17.

A flow of liquid is streamline, if the Reynold's number is

less than 1000
greater than 1000
between 2000 to 3000
between 4000 to 5000

18.

A pipe of 30 cm long and open at both the ends produces harmonics. Which harmonic mode of pipe resonates a 1.1 kHz source? Given, speed of sound in air = 330 ms^-1.