Q. A sound wave having wavelength λ from stationary waves after reflection from surface . the distance between two consecutive nodes is
-
(A)
λ
-
(B)
λ / 2
-
(C)
λ / 4
-
(D)
λ / 8
β
Correct Answer: (B)
λ / 2
Q. What is the resulting temperature t when 150 g of ice at 0 β is mixed with 300 g of water at 50 β ?
-
(A)
25β
-
(B)
33.3β
-
(C)
13.4β
-
(D)
6.6β
β
Correct Answer: (D)
6.6β
Q. Which of the following preferred rpm for 4 pole induction motor?
-
(A)
1500 rpm
-
(B)
1470 rpm
-
(C)
1440 rpm
-
(D)
1320 rpm
β
Correct Answer: (A)
1500 rpm
Q. An object placed at 60cm in front of a concave mirror makes an image 30 cm in front of the mirror, then what is the distance of the focus of the mirror.
-
(A)
10cm
-
(B)
5cm
-
(C)
20cm towards the mirror
-
(D)
20cm behind the mirror
β
Correct Answer: (C)
20cm towards the mirror
Q. A vehicle stops in 20 sec after applying brakes, if the constant retardation due to the brakes is 1.5 m/sec², then what was the initial velocity of the vehicle.
-
(A)
30m/sec
-
(B)
3m/sec
-
(C)
15m/sec
-
(D)
40m/sec
β
Correct Answer: (A)
30m/sec
Q. Time period of a simple pendulum is 1.5 sec. If the length of the pendulum is increased by 4 times then what is the new time period.
-
(A)
13 sec
-
(B)
3 sec
-
(C)
1 sec
-
(D)
5 sec
β
Correct Answer: (B)
3 sec
Q. Consider a static point charge. if the charge is negative, then the electric line of the forces are :
-
(A)
Concentric circles with charge at the centre
-
(B)
Straight lines radiating away from the charge
-
(C)
Straight lines converging towards the charge
-
(D)
Parallel straight lines
β
Correct Answer: (C)
Straight lines converging towards the charge
Q. A wire of resistance 10 Ω is elongated through a die to double its length . its resistance will change to
-
(A)
40 Ω
-
(B)
20 Ω
-
(C)
15 Ω
-
(D)
5 Ω
β
Correct Answer: (A)
40 Ω
Q. 50w and 250v is marked on a lamp. Then what is the value of the current flowing in the circuit.
-
(A)
0.5 Ampere
-
(B)
0.4 Ampere
-
(C)
0.2 Ampere
-
(D)
0.3 Ampere
β
Correct Answer: (C)
0.2 Ampere
Q. The time period of a pendulum depends on
-
(A)
The mass
-
(B)
The length
-
(C)
The time
-
(D)
Both the mass and the length
β
Correct Answer: (B)
The length
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