1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 $$ \times $$ 106 m above the surface of earth. If earth's radius is 6.38 $$ \times $$ 106 m and g = 9.8 ms$$-$$2, then the orbital speed of the satellite is
A
9.13 km s$$-$$1
B
6.67 km s$$-$$1
C
7.76 km s$$-$$1
D
8.56 km s$$-$$1
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A force $$\overrightarrow F = \alpha \widehat i + 3\widehat j + 6\widehat k$$ is acting at a point $$\overrightarrow r = 2\widehat i - 6\widehat j - 12\widehat k$$. The value of $$\alpha $$ for which angular momentum about origin is conserved is
A
zero
B
1
C
$$-$$ 1
D
2
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
Light of wavelength 500 nm is incifent on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted electron is
A
$$ \ge $$ 2.8 $$ \times $$ 10$$-$$9 m
B
$$ \le $$ 2.8 $$ \times $$ 10$$-$$12 m
C
< 2.8 $$ \times $$ 10$$-$$10 m
D
< 2.8 $$ \times $$ 10$$-$$9 m
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,
A
the linear momentum of S remains constant in magnitude.
B
the acceleration of S is always directed towards the centre of the earth.
C
the angular momentum of S about the centre of the earth changes in direction, but its magnitude remains constant.
D
the total mechanical energy of S varies periodically with time.