NTSE SAT Physics Papers 13

This is NTSE SAT Physics Papers 13 .. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

Two objects, one 4 times as massive as the other, are approaching each other under their mutual gravitational attraction. When the separation between the objects is 100 km, the acceleration of the lighter object is \(1\,m/{s^2}\). When the separation between them is 25 km, the acceleration of the heavier object is

A
\(1\,m/{s^2}\)
B
\(4\,m/{s^2}\)
Correct
C
\(8\,m/{s^2}\)
D
\(2\,m/{s^2}\)

A spring balance measures the weight of an object in air to be 0.1 N. It shows a reading of 0.08 N when the object is completely immersed in water. If the value of acceleration due to gravity is \(10\,m/{s^2}\), the volume of the object is

A
\(20\,c{m^{.3}}\)
B
\(200\,c{m^3}\)
C
\(80\,c{m^3}\)
D
\(2\,c{m^3}\)
Correct

A force of 10 N is applied on an object of mass 1 kg for 2 s, which was initially at rest. What is the work done on the object by the force?

A
200 J
Correct
B
20 J
C
16 J
D
180 J

Stethoscope of doctors for finding quality, strength and frequency of human heart beat is based on the principle of

A
SONAR
B
Multiple reflection
Correct
C
Reverberation
D
Echo

A ray of light is incident in medium 1 on a surface that separates medium 1 from medium 2. Let \({{\text{v}}_1}\)and \({{\text{v}}_2}\) represent the velocity of light in medium 1 and medium 2 respectively. Also let \({n_{12}}\) and \({n_{21}}\) represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. If i and r denote the angle of incidence and angle of refraction, then

A
\(\frac{{\sin i}}{{\sin r}} = {n_{21}} = \frac{{{v_2}}}{{{v_1}}}\)
B
\(\frac{{\sin i}}{{\sin r}} = {n_{21}} = \frac{{{v_1}}}{{{v_2}}}\)
Correct
C
\(\frac{{\sin i}}{{\sin r}} = {n_{12}} = \frac{{{v_1}}}{{{v_2}}}\)
D
\(\frac{{\sin i}}{{\sin r}} = {n_{12}} = \frac{{{v_1}}}{{{v_2}}}\)

A convex lens has a focal length of 0.5 m. It has to be combined with a second lens, so that the combination has a power of 1.5 dioptre. Which of the following could be the second lens?

A
A concave lens of focal length 2 m
Correct
B
A concave lens of focal length 0.5 m
C
A convex lens of focal length 2 m
D
Another convex lens of focal length 0.5 m

Which of the following statements is correct?

A
A person with myopia can see distant objects clearly
B
A person with hypermetropia can see nearby objects clearly
C
A person with myopia can see nearby objects clearly
Correct
D
A person with hypermetropia cannot see distant objects clearly

Consider two conducting plates A and B, between which the potential difference is 5 V, plate A being at a higher potential. A proton and an electron are released at plates A and B respectively. The two particles then move towards the opposite plates – the proton to plate B and the electron to plate A. which one will have a larger velocity when they reach their respective destination plates?

A
None will be able to reach the destination point
B
The electron will have the larger velocity
C
The proton will have the larger velocity
D
Both will have the same velocity
Correct

Which one of the following statements best describes the nature of the field lines due to a bar magnet?

A
Field lines start from the north pole and end on the south pole. Only one field line passes through a point
B
Field lines are continuous lines passing inside and outside the magnet. Any number of field lines can pass through a point
C
Field lines start from the north pole and end on the south pole. Any number of field lines can pass through a point
D
Field lines are continuous lines passing inside and outside the magnet. Only one field line passes through a point
Correct

Which of the following statements is correct?

A
AC generates has a permanent magnet whereas a DC generator has an electromagnet
B
There is a split-ring commutator in a DC generator but not in an AC generator
Correct
C
AC generator generates a higher voltage
D
DC generator generates a higher voltage

A star produces its energy through the process of

A
Nuclear fission
B
Nuclear fusion
Correct
C
Gravitational attraction between different parts of the star
D
Chemical reaction

What happens when a fixed amount of oxygen gas is taken in a cylinder and compressed at constant temperature? (i) Number of collision of oxygen molecules at per unit area of the wall of the cylinder increase (ii) Oxygen \(\left( {{O_2}} \right)\) gets converted into ozone \(\left( {{O_3}} \right)\) (iii) Kinetic energy of the molecules of oxygen gas increases

A
(ii) and (iii)
B
(iii) only
C
(i) only
Correct
D
(i) and (iii)

The solubility of a substance S in water is 28.6% (mass by volume) at \(50^\circ C\) . When 50 ml of its saturated solution at \(50^\circ C\) is cooled to \(40^\circ C\), 2.4 g of solid S separated out. The solubility of S in water at \(40^\circ C\)(mass by volume) is:

A
11.9%
B
23.8%
Correct
C
2.4%
D
26.2%

What mass of \(C{O_2}\) will be formed when 6 g of carbon is burnt in 32 g of oxygen?

A
26 g
B
12 g
C
38 g
D
22 g
Correct

The law of conservation of mass is valid for which of the following? 1) Reactions involving oxidation 2) Nuclear reactions 3) Endothermic reaction

A
2 and 3
B
2 only
C
1 and 3
Correct
D
1 and 2