ISAT previous year papers

I am a student of Indian Institute of Space Science and Technology and I have need of its previous year paper for take help in my exam prepation so please tell me the procedure of do download its PDF File from net

[Pathak]

Here I am attaching a file, from where you can download the ISAT previous year paper.

1. A projectile is fired at an angle 60◦ with some velocity u. If the angle is changed infinitesimally, let the corresponding fractional changes in the range and the time of flight be x and y, respectively, Then y is
(A) 2/3x
(B) −2/3x
(C) 2x
(D) −2x

3. A photon with an initial frequency 1011Hz scatters off an electron at rest. Its final frequency is 0.9×1011 Hz. The speed of the scattered electron is close to (h = 6.63×10−34 Js, me = 9.1×10−31 kg)
(A) 4 × 103 ms−1
(B) 3 × 102 ms−1
(C) 2 × 106 ms−1
(D) 30ms−1

4. Suppose the particle starts from r = 1 with a kinetic energy just enough to reach r = R. Its kinetic energy at r = R/2 will be
(A) k/R
(B) (5/8)(k/R)
(C) (3/8)(k/R)
(D) 0

For the rest of question paper, here is the attachment: