SMATEE TEST SERIES 24 PHYSICS
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1. The force between two small charged spheres having charges of 1 × 10
-7
C and 2 × 10
-7
C placed apart in air is
a) 4.5 × 10
-2
N
b) 4.5 × 10
-3
N
c) 5.4 × 10
-2
N
d) 5.4 × 10
-3
N
Deselect Answer
a)
b)
c)
d)
None
2. If a dipole of dipole moment is placed in a uniform electric field E, then torque acting on it is given by
Deselect Answer
a)
b)
c)
d)
None
3. Gauss’s law is valid for
a) any closed surface
b) only regular close surfaces
c) any open surface
d) only irregular open surfaces
Deselect Answer
a)
b)
c)
d)
None
4. 1 C charge is equivalent to charge on how much number of protons?
a) 6 × 10
18
b) 7 × 10
19
c) 8 × 10
20
d) 9 × 10
21
Deselect Answer
a)
b)
c)
d)
None
5. Which of the following graphs shows the correct variation of force when the distance r between two charges varies?
A) (a)
B) (b)
C) (c)
D) (d)
Deselect Answer
a)
b)
c)
d)
None
6. In hydrogen spectrum, the shortest wavelength in Balmer series is . The shortest wavelength in Brackett series will be
a) 2λ
b) 4λ
c) 9λ
d) 16λ
Deselect Answer
a)
b)
c)
d)
None
7. The shortest wavelength of Lyman series of hydrogen is equal to the shortest wavelength of Balmer series of a hydrogen-like atom of atomic number . The value of is
a) 4
b) 2
c) 3
d) 6
Deselect Answer
a)
b)
c)
d)
None
8. Two protons attract each other when
a) The distance between them is 10
-2
m
b) The distance between them is 10
-9
m
c) The distance between them is 10
-15
m
d) This will never happen
Deselect Answer
a)
b)
c)
d)
None
9. Which of the following has high penetration power?
a) α-particles
b) β-rays
c) γ-rays
d) X-rays
Deselect Answer
a)
b)
c)
d)
None
10. Which of the following pairs are isotones?
a)
1
H
2
and
1
H
3
b)
3
H
3
and
1
H
3
c)
6
C
12
and
7
N
13
a)
1
H
1
and
2
H
4
Deselect Answer
a)
b)
c)
d)
None
11. Rutherford’s a-particle experiment showed that the atoms have
a) Proton
b) Nucleus
c) Neutron
d) Electrons
Deselect Answer
a)
b)
c)
d)
None
12. As one considers orbits with higher values of in a hydrogen atom, the electric potential energy of the atom
a) decreases
b) increases
c) remains the same
d) does not increase
Deselect Answer
a)
b)
c)
d)
None
13. When an electron jumps from the fourth orbit to the second orbit, one gets the
a) second line of Paschen series
b) second line of Balmer series
c) first line of Pfund series
d) second line of Lyman series
Deselect Answer
a)
b)
c)
d)
None
14. The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He+ ion in the first excited state will be
a) –13.6 eV
b) – 27.2 eV
c) – 54.4 eV
d) – 6.8 eV
Deselect Answer
a)
b)
c)
d)
None
15. The longest wavelength of the Balmer series is 6563 Å. The Rydberg’s constant is
a) 1.09 × 10
5
m
-1
b) 1.09 × 10
6
m
-1
c) 1.09 × 10
7
m
-1
a) 1.09 × 10
8
m
-1
Deselect Answer
a)
b)
c)
d)
None
16. The ionization energy for H-atom is
a) 13.6 𝑒𝑉
b) 27.2 𝑒𝑉
c) 54.4 𝑒𝑉
d) 100 𝑒𝑉
Deselect Answer
a)
b)
c)
d)
None
18. Which of the following pairs are isotones?
(a)
1
H
2
and
1
H
3
(b)
3
Li
3
and
1
H
3
(c)
6
C
12
and
7
N
13
(a)
1
H
1
and
2
H
4
Deselect Answer
a)
b)
c)
d)
None
18. Lyman series lies in the
(a) Ultraviolet region
(b) Visible region
(c) Near IR region
(d) Far IR region
Deselect Answer
a)
b)
c)
d)
None
19. How many numbers of neutrons are produced when uranium atom is bombarded with a slow moving neutron?
(a) 2
(b) 3
(c) 4
(d) 5
Deselect Answer
a)
b)
c)
d)
None
20. In a nuclear reaction which of the following is conserved?
(a) Energy
(b) Spin
(c) Charge
(d) All of these
Deselect Answer
a)
b)
c)
d)
None
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